diff --git a/UnitTests/CoordinateSystem/RailPreservedPoseTests.cs b/UnitTests/CoordinateSystem/RailPreservedPoseTests.cs
index f416c13..97fe309 100644
--- a/UnitTests/CoordinateSystem/RailPreservedPoseTests.cs
+++ b/UnitTests/CoordinateSystem/RailPreservedPoseTests.cs
@@ -92,10 +92,79 @@ namespace NavisworksTransport.UnitTests.CoordinateSystem
         public void ShouldAllowFragmentPlanarFallback_ShouldDisableHoisting()
         {
             Assert.IsFalse(PathAnimationManager.ShouldAllowFragmentPlanarFallback(PathType.Hoisting));
-            Assert.IsTrue(PathAnimationManager.ShouldAllowFragmentPlanarFallback(PathType.Ground));
+            Assert.IsFalse(PathAnimationManager.ShouldAllowFragmentPlanarFallback(PathType.Ground));
             Assert.IsTrue(PathAnimationManager.ShouldAllowFragmentPlanarFallback(PathType.Rail));
         }
 
+        [TestMethod]
+        public void ShouldUseReferenceBasedRealObjectPlanarPose_ShouldDisableGroundAndHoisting()
+        {
+            Assert.IsFalse(PathAnimationManager.ShouldUseReferenceBasedRealObjectPlanarPose(PathType.Ground));
+            Assert.IsFalse(PathAnimationManager.ShouldUseReferenceBasedRealObjectPlanarPose(PathType.Hoisting));
+            Assert.IsTrue(PathAnimationManager.ShouldUseReferenceBasedRealObjectPlanarPose(PathType.Rail));
+        }
+
+        [TestMethod]
+        public void TryResolveDisplayedPlanarYawFromRotation_ShouldResolveYUpFromDisplayedXAxis()
+        {
+            Rotation3D rotation = new Rotation3D(
+                0.0,
+                System.Math.Sin(-System.Math.PI / 4.0),
+                0.0,
+                System.Math.Cos(-System.Math.PI / 4.0));
+
+            bool ok = PathAnimationManager.TryResolveDisplayedPlanarYawFromRotation(
+                rotation,
+                CoordinateSystemType.YUp,
+                out double yawRadians);
+
+            Assert.IsTrue(ok);
+            Assert.AreEqual(-System.Math.PI / 2.0, yawRadians, 1e-6);
+        }
+
+        [TestMethod]
+        public void ShouldUseGroundRealObjectPureIncrementFrames_ShouldEnableOnlyForGroundRealObjects()
+        {
+            Assert.IsTrue(PathAnimationManager.ShouldUseGroundRealObjectPureIncrementFrames(PathType.Ground, true));
+            Assert.IsFalse(PathAnimationManager.ShouldUseGroundRealObjectPureIncrementFrames(PathType.Ground, false));
+            Assert.IsFalse(PathAnimationManager.ShouldUseGroundRealObjectPureIncrementFrames(PathType.Hoisting, true));
+            Assert.IsFalse(PathAnimationManager.ShouldUseGroundRealObjectPureIncrementFrames(PathType.Rail, true));
+        }
+
+        [TestMethod]
+        public void TryResolveGroundHostPlanarYawFromFramePoints_ShouldResolveYUpHostYaw()
+        {
+            bool ok = PathAnimationManager.TryResolveGroundHostPlanarYawFromFramePoints(
+                new Point3D(0, 0, 0),
+                new Point3D(1, 0, 0),
+                new Point3D(1, 0, -1),
+                CoordinateSystemType.YUp,
+                out double yawRadians);
+
+            Assert.IsTrue(ok);
+            Assert.AreEqual(-System.Math.PI / 4.0, yawRadians, 1e-6);
+        }
+
+        [TestMethod]
+        public void ResolveGroundHostUpCorrectionRadians_ShouldUseYDegreesForYUp()
+        {
+            double radians = PathAnimationManager.ResolveGroundHostUpCorrectionRadians(
+                new LocalEulerRotationCorrection(10.0, 20.0, 30.0),
+                CoordinateSystemType.YUp);
+
+            Assert.AreEqual(20.0 * System.Math.PI / 180.0, radians, 1e-9);
+        }
+
+        [TestMethod]
+        public void ResolveGroundHostUpCorrectionRadians_ShouldUseZDegreesForZUp()
+        {
+            double radians = PathAnimationManager.ResolveGroundHostUpCorrectionRadians(
+                new LocalEulerRotationCorrection(10.0, 20.0, 30.0),
+                CoordinateSystemType.ZUp);
+
+            Assert.AreEqual(30.0 * System.Math.PI / 180.0, radians, 1e-9);
+        }
+
         [TestMethod]
         public void ResolveCurrentRotationBaseline_ShouldPreferActualGeometryForHoisting()
         {
diff --git a/doc/working/2026-04-08-ground-remove-fragment-dependency-plan.md b/doc/working/2026-04-08-ground-remove-fragment-dependency-plan.md
index e99339b..1dad3c6 100644
--- a/doc/working/2026-04-08-ground-remove-fragment-dependency-plan.md
+++ b/doc/working/2026-04-08-ground-remove-fragment-dependency-plan.md
@@ -34,7 +34,15 @@
 2. `Ground` 这条链不应该再扩散 `local/reference/fragment` 概念。
 3. `fragment` 现在的问题，不在于“所有地方都要立刻删”，而在于：
    - Ground 主链还会读它
-   - 导致姿态来源不稳定
+   - 导致旋转来源不稳定
+4. `Ground` 这条链仍然有旋转目标，但这个旋转目标不再来自 `fragment` 参考姿态解释。
+5. `Ground` 后续只需要求：
+   - 路径在宿主平面里的方向
+   - 对应的宿主平面旋转量
+6. 也就是说，`Ground` 不再求“reference-based pose”，而只求：
+   - `hostForward`
+   - `hostUp`
+   - `host-planar rotation delta`
 
 ---
 
@@ -43,7 +51,7 @@
 这轮只保留 3 个具体目标：
 
 1. `Ground` 初始化时，不再优先读 fragment 参考姿态
-2. `Ground` 平面姿态求解时，不再走 fragment 参考旋转入口
+2. `Ground` 平面姿态求解时，不再走 fragment 参考旋转入口，而只求宿主平面旋转量
 3. `Ground` 不再允许 fragment planar fallback
 
 只要这 3 点做到，就算这一轮完成。
@@ -63,6 +71,7 @@
 - 当 `PathType == Ground` 且是真实物体时
 - 不再去走 `TryCaptureRealObjectReferenceRotation(...)`
 - 直接改用当前实际几何姿态，或现有非 fragment 入口
+- 这一步的目的不是继续建立另一套“参考姿态定义”，而只是拿到当前增量起点
 
 ### 4.2 平面姿态求解入口
 
@@ -74,7 +83,11 @@
 要求：
 
 - `Ground` 不再从这里拿 fragment 参考旋转
-- `Ground` 单独走非 fragment 的姿态来源
+- `Ground` 不再继续求 reference-based pose
+- `Ground` 只求宿主平面旋转量：
+  - 路径 `hostForward`
+  - 宿主 `hostUp`
+  - 当前对象在宿主坐标系下要追加的平面旋转量
 
 ### 4.3 fallback 入口
 
@@ -94,7 +107,8 @@
 
 1. 先改 `Ground` 初始化入口
 2. 再改 `Ground` 平面姿态求解入口
-3. 最后关掉 `Ground` 的 fragment fallback
+3. 再改 `Ground` 尺寸/通行空间入口，避免它们继续偷偷走 `reference-based pose`
+4. 最后关掉 `Ground` 的 fragment fallback
 
 每一步都要求：
 
@@ -102,6 +116,67 @@
 - 只改 `Ground`
 - 不顺手改别的路径
 
+### 5.1 2026-04-07 夜间分析结论
+
+第一刀已经证明：
+
+- `Ground` 初始化入口可以先切掉 fragment
+- 但这还不够
+
+这次日志暴露出的真正问题是：
+
+- `Ground` 虽然不再直接读 fragment
+- 但起点姿态求解仍然在走 `TryCreateRealObjectPlanarPoseSolution(...)`
+- 也就是仍然在走 `reference-based pose` 入口
+
+所以第二刀必须明确成：
+
+1. `Ground` 不再进入 `TryCreateRealObjectPlanarPoseSolution(...)`
+2. `Ground` 起点旋转改成：
+   - 当前显示旋转
+   - 当前宿主平面 yaw
+   - 路径目标宿主平面 yaw
+   - 基于这三者直接求目标旋转
+3. 也就是 `Ground` 只保留：
+   - 当前显示状态作为增量起点
+   - 路径方向作为目标方向
+   - 宿主平面旋转量作为唯一旋转语义
+
+### 5.2 现有链路与目标链路
+
+当前代码里，`Ground + 真实物体` 至少有 3 个入口会接触姿态：
+
+1. 起点
+   - `MoveObjectToPathStart(...)`
+   - `TryCreatePlanarPathRotationAtStart(...)`
+   - `TryCreateRealObjectPlanarRotationFromHostForward(...)`
+2. 逐帧
+   - `ApplyGroundAnimationFrame(...)`
+3. 尺寸/通行空间
+   - `TryCalculateCurrentRealObjectPlanarProjectedExtents(...)`
+
+这一轮的目标链路应该统一成：
+
+1. 初始化
+   - 当前显示姿态只用来拿“当前增量起点”
+   - 不再把它包装成 `referenceRotation`
+2. 起点/逐帧旋转
+   - 只求 `hostForward`
+   - 只求宿主平面旋转量
+   - 不再进入 `TryCreateRealObjectPlanarPoseSolution(...)`
+   - 起点应用层不再走 `currentRotation -> targetRotation -> deltaRotation`
+   - 改成直接施加宿主轴旋转增量，再补平移把 tracked point 拉回目标点
+3. 尺寸/通行空间
+   - 对 `Ground` 直接复用固定业务约定：
+     - `forward = PositiveX`
+     - `up = HostUp`
+   - 不再通过 `reference-based pose` 推导 `ModelAxisConvention`
+
+这 3 条链必须保持同一件事：
+
+- `Ground` 不再解释 reference pose
+- `Ground` 只解释“当前显示状态 + 路径方向 + 宿主平面旋转量”
+
 ---
 
 ## 6. 验证标准
@@ -112,9 +187,14 @@
    - `Ground + 真实物体` 到起点后不再读 fragment 姿态
 
 2. 逐帧
-   - `Ground` 播放时姿态来源不再依赖 fragment
+   - `Ground` 播放时旋转来源不再依赖 fragment
+   - `Ground` 只根据路径方向继续求宿主平面旋转量
 
-3. fallback
+3. 尺寸/通行空间
+   - `Ground` 的 projected extents 不再因为 fragment/reference pose 缺失而失败
+   - `Ground` 的 `ModelAxisConvention` 不再来自 `TryCreateRealObjectPlanarPoseSolution(...)`
+
+4. fallback
    - `Ground` 关闭 fragment fallback 后，主链要么成功，要么明确报错
    - 不允许再偷偷回退
 
@@ -134,3 +214,41 @@
 - 统一三类路径的所有姿态入口
 
 这些都属于下一轮的事。
+
+---
+
+## 8. 2026-04-08 夜间新增：Ground 角度调整的最小实现策略
+
+在 `Ground + 真实物体` 这条新纯增量链上，角度调整不再通过“完整目标姿态重建”实现，而只允许走最单纯的宿主增量法：
+
+1. `up` 轴修正
+   - 不单独构造三维姿态
+   - 直接并入路径目标 `yaw`
+   - `YUp` 取 `YDegrees`
+   - `ZUp` 取 `ZDegrees`
+
+2. 非 `up` 轴修正
+   - 不与 `yaw` 一次性组合
+   - 只在起点落位后，围绕业务跟踪点按宿主轴逐次增量应用
+   - 当前约定：
+     - `YUp`：应用 `XDegrees`、`ZDegrees`
+     - `ZUp`：应用 `XDegrees`、`YDegrees`
+
+3. 逐帧播放
+   - 继续只吃“路径宿主平面角 + up 轴修正”
+   - 不在每帧重复叠加非 `up` 轴修正
+   - 非 `up` 轴修正应由起点姿态一次性建立，并在后续 `yaw` 增量中自然保持
+
+### 明早优先验证
+
+1. `Ground + 真实物体` 到起点
+   - 位置是否继续保持正确
+   - `X/Y/Z` 角度调整是否真正进入增量旋转链
+
+2. `Ground` 逐帧播放
+   - 转弯是否仍保持当前已修好的效果
+   - `up` 轴修正是否能跟随路径持续生效
+
+3. 非 `up` 轴修正
+   - 是否表现为“起点一次性按宿主轴旋转”
+   - 播放过程中不应每帧累加放大
diff --git a/src/Core/Animation/PathAnimationManager.cs b/src/Core/Animation/PathAnimationManager.cs
index 8cc6b3a..65cc77d 100644
--- a/src/Core/Animation/PathAnimationManager.cs
+++ b/src/Core/Animation/PathAnimationManager.cs
@@ -77,6 +77,7 @@ namespace NavisworksTransport.Core.Animation
         public double Progress { get; set; }              // 进度(0-1)
         public Point3D Position { get; set; }             // 该帧的位置
         public double YawRadians { get; set; }            // 绕Z轴的偏航角（弧度）
+        public double? GroundHostPlanarYawRadians { get; set; } // Ground真实物体逐帧宿主平面角
         public Rotation3D Rotation { get; set; }          // 可选的完整三维姿态
         public bool HasCustomRotation { get; set; }       // 是否使用完整三维姿态
         public List<CollisionResult> Collisions { get; set; } // 该帧的碰撞结果
@@ -86,6 +87,7 @@ namespace NavisworksTransport.Core.Animation
         {
             Collisions = new List<CollisionResult>();
             YawRadians = 0.0;
+            GroundHostPlanarYawRadians = null;
             Rotation = Rotation3D.Identity;
             HasCustomRotation = false;
         }
@@ -738,8 +740,9 @@ namespace NavisworksTransport.Core.Animation
                     LogManager.Debug($"[移动到起点] 地面/空轨路径使用路径方向: {yaw * 180 / Math.PI:F2}度");
                 }
 
-                // 旧 yaw 链仅保留给未进入完整三维姿态的遗留路径。
-                if (!_objectRotationCorrection.IsZero)
+                // 旧 yaw 链仅保留给未进入 Ground 纯增量主链的遗留路径。
+                if (!_objectRotationCorrection.IsZero &&
+                    !(_route.PathType == PathType.Ground && IsRealObjectMode))
                 {
                     double correctionRad = _objectRotationCorrection.ZDegrees * Math.PI / 180.0;
                     yaw += correctionRad;
@@ -802,7 +805,41 @@ namespace NavisworksTransport.Core.Animation
                     $"[路径起点诊断] 路径point0=({pathStartPoint.X:F3},{pathStartPoint.Y:F3},{pathStartPoint.Z:F3}), " +
                     $"起点目标trackedPoint=({startPosition.X:F3},{startPosition.Y:F3},{startPosition.Z:F3}), 路径类型={_route.PathType.GetDisplayName()}");
 
-                if (_route.PathType != PathType.Rail &&
+                if (IsRealObjectMode &&
+                    _route.PathType == PathType.Ground &&
+                    TryApplyGroundStartIncrementalTransform(startPosition, out double groundTargetYawRadians))
+                {
+                    LogManager.Info("[移动到起点] Ground 真实物体已应用纯增量旋转+平移");
+
+                    var startAppliedPoint = GetLiveBoundingBoxCenter(CurrentControlledObject ?? _animatedObject);
+                    LogManager.Info(
+                        $"[路径起点诊断] 起点应用后实际包围盒中心=({startAppliedPoint.X:F3},{startAppliedPoint.Y:F3},{startAppliedPoint.Z:F3}), " +
+                        $"相对目标偏差=({startAppliedPoint.X - startPosition.X:F3},{startAppliedPoint.Y - startPosition.Y:F3},{startAppliedPoint.Z - startPosition.Z:F3})");
+
+                    var startOffset = new Vector3D(
+                        startPosition.X - startAppliedPoint.X,
+                        startPosition.Y - startAppliedPoint.Y,
+                        startPosition.Z - startAppliedPoint.Z);
+                    double startOffsetLength = Math.Sqrt(
+                        startOffset.X * startOffset.X +
+                        startOffset.Y * startOffset.Y +
+                        startOffset.Z * startOffset.Z);
+
+                    LogManager.Info(
+                        $"[路径起点诊断] 落位偏差=({startOffset.X:F3},{startOffset.Y:F3},{startOffset.Z:F3}), 长度={startOffsetLength:F3} (仅记录，不二次补偿)");
+
+                    _groundRealObjectBaseRotation = _trackedRotation;
+                    _groundRealObjectBaseYaw = groundTargetYawRadians;
+                    _hasGroundRealObjectBasePose = true;
+                    _groundRealObjectStartCompensation = new Vector3D(0, 0, 0);
+                    _hasGroundRealObjectStartCompensation = false;
+                    _hasHoistingRealObjectBasePose = false;
+
+                    LogManager.Info(
+                        $"[Ground真实物体基姿态] {animatedObject.DisplayName} BaseYaw={_groundRealObjectBaseYaw * 180.0 / Math.PI:F2}°, " +
+                        $"已记录基姿态={_hasGroundRealObjectBasePose} (纯增量链)");
+                }
+                else if (_route.PathType != PathType.Rail &&
                     TryCreatePlanarPathRotationAtStart(out var planarRotation))
                 {
                     UpdateObjectPosition(startPosition, planarRotation);
@@ -1336,7 +1373,23 @@ namespace NavisworksTransport.Core.Animation
                         Collisions = new List<CollisionResult>()
                     };
 
-                    if (ShouldPreservePathRotationForFrames(
+                    if (ShouldUseGroundRealObjectPureIncrementFrames(_route.PathType, IsRealObjectMode))
+                    {
+                        if (!TryResolveGroundHostPlanarYawFromFramePoints(
+                                previousFramePoint,
+                                framePosition,
+                                nextFramePoint,
+                                CoordinateSystemManager.Instance.ResolvedType,
+                                out double groundHostPlanarYawRadians))
+                        {
+                            throw new InvalidOperationException(
+                                $"Ground真实物体第 {i} 帧未能解析宿主平面目标角。");
+                        }
+
+                        frame.GroundHostPlanarYawRadians = groundHostPlanarYawRadians;
+                        frame.YawRadians = groundHostPlanarYawRadians;
+                    }
+                    else if (ShouldPreservePathRotationForFrames(
                             _route.PathType,
                             _objectStartPlacementMode,
                             _hasPathPreservedPoseRotation))
@@ -3947,7 +4000,76 @@ namespace NavisworksTransport.Core.Animation
 
         internal static bool ShouldAllowFragmentPlanarFallback(PathType pathType)
         {
-            return pathType != PathType.Hoisting;
+            return pathType != PathType.Hoisting && pathType != PathType.Ground;
+        }
+
+        internal static bool ShouldUseReferenceBasedRealObjectPlanarPose(PathType pathType)
+        {
+            return pathType != PathType.Ground && pathType != PathType.Hoisting;
+        }
+
+        internal static bool ShouldUseGroundRealObjectPureIncrementFrames(PathType pathType, bool isRealObjectMode)
+        {
+            return pathType == PathType.Ground && isRealObjectMode;
+        }
+
+        internal static bool TryResolveDisplayedPlanarYawFromRotation(
+            Rotation3D rotation,
+            CoordinateSystemType hostType,
+            out double yawRadians)
+        {
+            yawRadians = 0.0;
+            if (rotation == null)
+            {
+                return false;
+            }
+
+            Matrix3 linear = new Transform3D(rotation).Linear;
+            Vector3 hostForward = new Vector3(
+                (float)linear.Get(0, 0),
+                (float)linear.Get(1, 0),
+                (float)linear.Get(2, 0));
+
+            return PathTargetFrameResolver.TryResolvePlanarHostYaw(hostForward, hostType, out yawRadians);
+        }
+
+        internal static double ResolveGroundHostUpCorrectionRadians(
+            LocalEulerRotationCorrection correction,
+            CoordinateSystemType hostType)
+        {
+            double degrees = hostType == CoordinateSystemType.YUp
+                ? correction.YDegrees
+                : correction.ZDegrees;
+            return degrees * Math.PI / 180.0;
+        }
+
+        internal static bool TryResolveGroundHostPlanarYawFromFramePoints(
+            Point3D previousPoint,
+            Point3D currentPoint,
+            Point3D nextPoint,
+            CoordinateSystemType hostType,
+            out double yawRadians)
+        {
+            yawRadians = 0.0;
+
+            Vector3 hostForward = new Vector3(
+                (float)(nextPoint.X - previousPoint.X),
+                (float)(nextPoint.Y - previousPoint.Y),
+                (float)(nextPoint.Z - previousPoint.Z));
+            if (hostForward.LengthSquared() < 1e-6f)
+            {
+                hostForward = new Vector3(
+                    (float)(nextPoint.X - currentPoint.X),
+                    (float)(nextPoint.Y - currentPoint.Y),
+                    (float)(nextPoint.Z - currentPoint.Z));
+            }
+
+            if (hostForward.LengthSquared() < 1e-6f)
+            {
+                return false;
+            }
+
+            return PathTargetFrameResolver.TryResolvePlanarHostYaw(hostForward, hostType, out yawRadians);
         }
 
         internal static Rotation3D ResolveCurrentRotationBaseline(
@@ -4312,6 +4434,134 @@ namespace NavisworksTransport.Core.Animation
             return PathTargetFrameResolver.TryResolvePlanarStartHostYaw(_route.PathType, hostPoints, hostType, out yawRadians);
         }
 
+        private bool TryApplyGroundStartIncrementalTransform(Point3D targetTrackedPosition, out double targetYawRadians)
+        {
+            targetYawRadians = 0.0;
+
+            if (!IsRealObjectMode ||
+                _route?.PathType != PathType.Ground ||
+                CurrentControlledObject == null ||
+                _pathPoints == null ||
+                _pathPoints.Count < 2)
+            {
+                return false;
+            }
+
+            if (!PathTargetFrameResolver.TryResolvePlanarStartHostForward(
+                    PathType.Ground,
+                    _pathPoints,
+                    out var hostForward))
+            {
+                LogManager.Error("[Ground纯增量起点] 无法解析路径起始方向。");
+                return false;
+            }
+
+            var adapter = CoordinateSystemManager.Instance.CreateHostAdapter();
+            if (!PathTargetFrameResolver.TryResolvePlanarHostYaw(hostForward, adapter.HostType, out targetYawRadians))
+            {
+                LogManager.Error("[Ground纯增量起点] 无法从路径方向解析宿主平面角。");
+                return false;
+            }
+
+            ApplyGroundNonUpAxisCorrectionsAtTrackedPosition(_trackedPosition, adapter.HostType);
+
+            Rotation3D currentRotation = Rotation3D.Identity;
+            if (!ModelItemTransformHelper.TryGetCurrentGeometryRotation(CurrentControlledObject, out currentRotation))
+            {
+                if (_hasTrackedRotation)
+                {
+                    currentRotation = _trackedRotation;
+                }
+                else
+                {
+                    LogManager.Error("[Ground纯增量起点] 无法读取当前显示旋转。");
+                    return false;
+                }
+            }
+
+            if (!TryResolveDisplayedPlanarYawFromRotation(currentRotation, adapter.HostType, out double currentYawRadians))
+            {
+                LogManager.Error("[Ground纯增量起点] 无法从当前显示状态解析宿主平面角。");
+                return false;
+            }
+
+            double upAxisCorrectionRadians = ResolveGroundHostUpCorrectionRadians(
+                _objectRotationCorrection,
+                adapter.HostType);
+            targetYawRadians = NormalizeRadians(targetYawRadians + upAxisCorrectionRadians);
+            double deltaYawRadians = NormalizeRadians(targetYawRadians - currentYawRadians);
+            LogManager.Info(
+                $"[Ground纯增量起点] 当前Yaw={currentYawRadians * 180.0 / Math.PI:F2}°, " +
+                $"目标Yaw={targetYawRadians * 180.0 / Math.PI:F2}°, 增量Yaw={deltaYawRadians * 180.0 / Math.PI:F2}°, " +
+                $"当前跟踪点=({_trackedPosition.X:F3},{_trackedPosition.Y:F3},{_trackedPosition.Z:F3}), " +
+                $"目标跟踪点=({targetTrackedPosition.X:F3},{targetTrackedPosition.Y:F3},{targetTrackedPosition.Z:F3})");
+
+            ModelItemTransformHelper.MoveItemIncrementallyByAxisRotationAndTranslation(
+                CurrentControlledObject,
+                _trackedPosition,
+                adapter.HostUpVector3,
+                deltaYawRadians,
+                targetTrackedPosition);
+
+            _trackedPosition = targetTrackedPosition;
+
+            if (ModelItemTransformHelper.TryGetCurrentGeometryRotation(CurrentControlledObject, out var appliedRotation))
+            {
+                _trackedRotation = appliedRotation;
+                _hasTrackedRotation = true;
+            }
+            else
+            {
+                _trackedRotation = currentRotation;
+                _hasTrackedRotation = true;
+            }
+
+            _currentYaw = targetYawRadians;
+            LogHostActualPoseAxes(CurrentControlledObject, "[Ground纯增量起点应用后宿主姿态]", false);
+            return true;
+        }
+
+        private void ApplyGroundNonUpAxisCorrectionsAtTrackedPosition(
+            Point3D trackedPosition,
+            CoordinateSystemType hostType)
+        {
+            if (CurrentControlledObject == null || _objectRotationCorrection.IsZero)
+            {
+                return;
+            }
+
+            var correctionSteps = new List<(string AxisName, Vector3 HostAxis, double AngleRadians)>();
+            correctionSteps.Add(("X", Vector3.UnitX, _objectRotationCorrection.XDegrees * Math.PI / 180.0));
+
+            if (hostType == CoordinateSystemType.YUp)
+            {
+                correctionSteps.Add(("Z", Vector3.UnitZ, _objectRotationCorrection.ZDegrees * Math.PI / 180.0));
+            }
+            else
+            {
+                correctionSteps.Add(("Y", Vector3.UnitY, _objectRotationCorrection.YDegrees * Math.PI / 180.0));
+            }
+
+            foreach (var step in correctionSteps)
+            {
+                if (Math.Abs(step.AngleRadians) < 1e-9)
+                {
+                    continue;
+                }
+
+                LogManager.Info(
+                    $"[Ground纯增量起点角度修正] 宿主{step.AxisName}轴增量={step.AngleRadians * 180.0 / Math.PI:F2}°, " +
+                    $"跟踪点=({trackedPosition.X:F3},{trackedPosition.Y:F3},{trackedPosition.Z:F3})");
+
+                ModelItemTransformHelper.MoveItemIncrementallyByAxisRotationAndTranslation(
+                    CurrentControlledObject,
+                    trackedPosition,
+                    step.HostAxis,
+                    step.AngleRadians,
+                    trackedPosition);
+            }
+        }
+
         private static double NormalizeRadians(double angle)
         {
             while (angle > Math.PI)
@@ -4509,7 +4759,7 @@ namespace NavisworksTransport.Core.Animation
             convention = null;
             extents = (0.0, 0.0, 0.0);
 
-            bool requiresReferenceRotation = _route?.PathType != PathType.Hoisting;
+            bool requiresReferenceRotation = ShouldUseReferenceBasedRealObjectPlanarPose(_route?.PathType ?? PathType.Ground);
             if (!IsRealObjectMode ||
                 (requiresReferenceRotation && !_hasRealObjectReferenceRotation) ||
                 _realObjectLength <= 0.0 ||
@@ -4526,31 +4776,22 @@ namespace NavisworksTransport.Core.Animation
             }
 
             if (_route?.PathType == PathType.Ground &&
-                _hasGroundRealObjectBasePose &&
-                TryCreateGroundRealObjectConstrainedRotationFromHostForward(hostForward, out var constrainedRotation))
+                TryCreateRealObjectPlanarRotationFromHostForward(hostForward, out var groundRotation))
             {
-                if (!TryCreateRealObjectPlanarPoseSolution(
-                        targetFrame.Forward,
-                        targetFrame.Up,
-                        out var constrainedSolution))
-                {
-                    return false;
-                }
-
-                LocalAxisDirection constrainedSemanticUpAxis =
+                LocalAxisDirection groundSemanticUpAxis =
                     adapter.HostType == CoordinateSystemType.YUp
                         ? LocalAxisDirection.PositiveY
                         : LocalAxisDirection.PositiveZ;
-                convention = new ModelAxisConvention(constrainedSolution.SelectedReferenceAxisDirection, constrainedSemanticUpAxis);
+                convention = new ModelAxisConvention(LocalAxisDirection.PositiveX, groundSemanticUpAxis);
 
-                Quaternion constrainedFinalHostQuaternion = Rotation3DToHostQuaternion(constrainedRotation);
+                Quaternion groundFinalHostQuaternion = Rotation3DToHostQuaternion(groundRotation);
                 extents = RealObjectProjectedExtentResolver.CalculateProjectedSemanticExtents(
                     convention,
                     _realObjectLength,
                     _realObjectWidth,
                     _realObjectHeight,
-                    constrainedSolution.BaselineRotation,
-                    constrainedFinalHostQuaternion,
+                    groundFinalHostQuaternion,
+                    groundFinalHostQuaternion,
                     targetFrame.Forward,
                     targetFrame.Up);
                 return true;
@@ -4961,6 +5202,54 @@ namespace NavisworksTransport.Core.Animation
                 return false;
             }
 
+            var adapter = CoordinateSystemManager.Instance.CreateHostAdapter();
+            if (_route?.PathType == PathType.Ground)
+            {
+                Rotation3D actualRotation = Rotation3D.Identity;
+                bool hasActualRotation =
+                    _animatedObject != null &&
+                    ModelItemTransformHelper.TryGetCurrentGeometryRotation(_animatedObject, out actualRotation);
+
+                if (!hasActualRotation && _hasTrackedRotation)
+                {
+                    actualRotation = _trackedRotation;
+                    hasActualRotation = true;
+                }
+
+                if (!hasActualRotation)
+                {
+                    LogManager.Error("[真实物体起点姿态] Ground 无法读取当前实际几何姿态，禁止回退到 reference-based pose。");
+                    return false;
+                }
+
+                if (!TryResolveDisplayedPlanarYawFromRotation(actualRotation, adapter.HostType, out double currentYawRadians))
+                {
+                    LogManager.Error("[真实物体起点姿态] Ground 无法从当前显示姿态解析宿主平面角。");
+                    return false;
+                }
+
+                if (!PathTargetFrameResolver.TryResolvePlanarHostYaw(hostForward, adapter.HostType, out double targetYawRadians))
+                {
+                    LogManager.Error("[真实物体起点姿态] Ground 无法从路径方向解析宿主平面角。");
+                    return false;
+                }
+
+                Quaternion targetQuaternion = HoistingRealObjectPoseHelper.CreateRotationFromPlanarBasePose(
+                    Rotation3DToHostQuaternion(actualRotation),
+                    currentYawRadians,
+                    targetYawRadians,
+                    adapter.HostUpVector3);
+                rotation = adapter.FromHostQuaternionDirect(targetQuaternion);
+
+                Matrix4x4 targetLinear = Matrix4x4.CreateFromQuaternion(targetQuaternion);
+                LogManager.Debug(
+                    $"[Ground宿主平面旋转] 当前Yaw={currentYawRadians * 180.0 / Math.PI:F2}°, 目标Yaw={targetYawRadians * 180.0 / Math.PI:F2}°, " +
+                    $"hostXAxis=({targetLinear.M11:F4},{targetLinear.M21:F4},{targetLinear.M31:F4}), " +
+                    $"hostYAxis=({targetLinear.M12:F4},{targetLinear.M22:F4},{targetLinear.M32:F4}), " +
+                    $"hostZAxis=({targetLinear.M13:F4},{targetLinear.M23:F4},{targetLinear.M33:F4})");
+                return true;
+            }
+
             if (!TryCreateRealObjectPlanarPoseSolution(
                 targetFrame.Forward,
                 targetFrame.Up,
@@ -4969,7 +5258,6 @@ namespace NavisworksTransport.Core.Animation
                 return false;
             }
 
-            var adapter = CoordinateSystemManager.Instance.CreateHostAdapter();
             LocalEulerRotationCorrection localCorrection = ResolveRealObjectLocalRotationCorrection();
             Quaternion hostComposedQuaternion = adapter.ComposeHostQuaternion(solution.BaselineRotation, localCorrection);
             rotation = adapter.FromHostQuaternionDirect(hostComposedQuaternion);
@@ -5015,6 +5303,11 @@ namespace NavisworksTransport.Core.Animation
         {
             solution = null;
 
+            if (!ShouldUseReferenceBasedRealObjectPlanarPose(_route?.PathType ?? PathType.Ground))
+            {
+                return false;
+            }
+
             if (!TryGetRealObjectReferenceRotation(out var referenceRotation))
             {
                 return false;
@@ -5121,7 +5414,8 @@ namespace NavisworksTransport.Core.Animation
 
             try
             {
-                if (TryCaptureRealObjectReferenceRotation(_animatedObject, out referenceRotation))
+                if (_route?.PathType != PathType.Ground &&
+                    TryCaptureRealObjectReferenceRotation(_animatedObject, out referenceRotation))
                 {
                     return true;
                 }
@@ -5198,7 +5492,12 @@ namespace NavisworksTransport.Core.Animation
 
             try
             {
-                Rotation3D fallbackRotation3D = sourceObject.Transform?.Factor().Rotation ?? Rotation3D.Identity;
+                Rotation3D fallbackRotation3D = Rotation3D.Identity;
+                if (!ModelItemTransformHelper.TryGetCurrentGeometryRotation(sourceObject, out fallbackRotation3D))
+                {
+                    fallbackRotation3D = sourceObject.Transform?.Factor().Rotation ?? Rotation3D.Identity;
+                }
+
                 referenceRotation = new Quaternion(
                     (float)fallbackRotation3D.A,
                     (float)fallbackRotation3D.B,
@@ -5240,7 +5539,7 @@ namespace NavisworksTransport.Core.Animation
                 _hasRealObjectReferenceRotation = true;
 
                 LogManager.Warning(
-                    $"[真实物体参考姿态] {sourceObject.DisplayName} fragment 姿态不可用，已退回默认参考姿态继续业务流程: " +
+                    $"[真实物体参考姿态] {sourceObject.DisplayName} 已改用非 fragment 参考姿态继续业务流程: " +
                     $"FallbackX=({_realObjectReferenceAxisX.X:F4},{_realObjectReferenceAxisX.Y:F4},{_realObjectReferenceAxisX.Z:F4}), " +
                     $"FallbackY=({_realObjectReferenceAxisY.X:F4},{_realObjectReferenceAxisY.Y:F4},{_realObjectReferenceAxisY.Z:F4}), " +
                     $"FallbackZ=({_realObjectReferenceAxisZ.X:F4},{_realObjectReferenceAxisZ.Y:F4},{_realObjectReferenceAxisZ.Z:F4}), " +
@@ -5279,6 +5578,23 @@ namespace NavisworksTransport.Core.Animation
                 return;
             }
 
+            if (!isVirtualObject &&
+                _route?.PathType == PathType.Ground &&
+                ModelItemTransformHelper.TryGetCurrentGeometryRotation(sourceObject, out var groundActualGeometryRotation))
+            {
+                _trackedRotation = groundActualGeometryRotation;
+                _hasTrackedRotation = true;
+                _currentYaw = ModelItemTransformHelper.GetYawFromRotation(_trackedRotation);
+
+                var linear = new Transform3D(_trackedRotation).Linear;
+                LogManager.Info(
+                    $"[真实物体当前姿态] {sourceObject.DisplayName} Ground 路径已改用实际几何姿态同步，不再读取 fragment 参考姿态: " +
+                    $"X=({linear.Get(0, 0):F4},{linear.Get(1, 0):F4},{linear.Get(2, 0):F4}), " +
+                    $"Y=({linear.Get(0, 1):F4},{linear.Get(1, 1):F4},{linear.Get(2, 1):F4}), " +
+                    $"Z=({linear.Get(0, 2):F4},{linear.Get(1, 2):F4},{linear.Get(2, 2):F4})");
+                return;
+            }
+
             if (!isVirtualObject && TryCaptureRealObjectReferenceRotation(sourceObject, out Quaternion referenceRotation))
             {
                 var adapter = CoordinateSystemManager.Instance.CreateHostAdapter();
@@ -5574,17 +5890,14 @@ namespace NavisworksTransport.Core.Animation
 
             double actualYaw = frameData.YawRadians;
 
-            if (frameData.HasCustomRotation)
+            if (ShouldUseGroundRealObjectPureIncrementFrames(_route?.PathType ?? PathType.Ground, IsRealObjectMode) &&
+                frameData.GroundHostPlanarYawRadians.HasValue)
             {
-                // 🔥 Ground路径动画播放：使用 _trackedPosition 计算增量，不重新读取包围盒
-                if (_route?.PathType == PathType.Ground && IsRealObjectMode)
-                {
-                    ApplyGroundAnimationFrame(frameData.Position, frameData.Rotation);
-                }
-                else
-                {
-                    UpdateObjectPosition(frameData.Position, frameData.Rotation);
-                }
+                ApplyGroundAnimationFrame(frameData.Position, frameData.GroundHostPlanarYawRadians.Value);
+            }
+            else if (frameData.HasCustomRotation)
+            {
+                UpdateObjectPosition(frameData.Position, frameData.Rotation);
             }
             else if (_route?.PathType == PathType.Ground || _route?.PathType == PathType.Hoisting)
             {
@@ -5600,28 +5913,41 @@ namespace NavisworksTransport.Core.Animation
         /// <summary>
         /// 专门用于Ground路径动画帧播放。使用业务跟踪点 _trackedPosition 作为当前位置，不读取实时包围盒中心回写主链。
         /// </summary>
-        private void ApplyGroundAnimationFrame(Point3D targetPosition, Rotation3D targetRotation)
+        private void ApplyGroundAnimationFrame(Point3D targetPosition, double targetYawRadians)
         {
             var controlledObject = CurrentControlledObject;
             if (controlledObject == null) return;
 
-            // 使用业务跟踪点 _trackedPosition 作为当前位置，不把实时包围盒中心混入主链
             Point3D currentPosition = _trackedPosition;
-            Rotation3D currentRotation = _hasTrackedRotation ? _trackedRotation : Rotation3D.Identity;
+            double currentYawRadians = _currentYaw;
+            targetYawRadians = NormalizeRadians(
+                targetYawRadians +
+                ResolveGroundHostUpCorrectionRadians(
+                    _objectRotationCorrection,
+                    CoordinateSystemManager.Instance.ResolvedType));
+            double deltaYawRadians = NormalizeRadians(targetYawRadians - currentYawRadians);
+            Vector3 hostUp = Vector3.Normalize(CoordinateSystemManager.Instance.CreateHostAdapter().HostUpVector3);
 
-            // 简单增量变换，不使用包围盒
-            ModelItemTransformHelper.MoveItemIncrementallyToPositionAndRotation(
+            LogManager.Debug(
+                $"[Ground纯增量逐帧] 当前Yaw={currentYawRadians * 180.0 / Math.PI:F2}°, " +
+                $"目标Yaw={targetYawRadians * 180.0 / Math.PI:F2}°, 增量Yaw={deltaYawRadians * 180.0 / Math.PI:F2}°, " +
+                $"当前跟踪点=({currentPosition.X:F3},{currentPosition.Y:F3},{currentPosition.Z:F3}), " +
+                $"目标跟踪点=({targetPosition.X:F3},{targetPosition.Y:F3},{targetPosition.Z:F3})");
+
+            ModelItemTransformHelper.MoveItemIncrementallyByAxisRotationAndTranslation(
                 controlledObject,
                 currentPosition,
-                currentRotation,
-                targetPosition,
-                targetRotation);
+                hostUp,
+                deltaYawRadians,
+                targetPosition);
 
-            // 更新跟踪状态
             _trackedPosition = targetPosition;
-            _trackedRotation = targetRotation;
-            _hasTrackedRotation = true;
-            _currentYaw = ModelItemTransformHelper.GetYawFromRotation(targetRotation);
+            if (ModelItemTransformHelper.TryGetCurrentGeometryRotation(controlledObject, out Rotation3D appliedRotation))
+            {
+                _trackedRotation = appliedRotation;
+                _hasTrackedRotation = true;
+            }
+            _currentYaw = targetYawRadians;
         }
 
 
diff --git a/src/Utils/ModelItemTransformHelper.cs b/src/Utils/ModelItemTransformHelper.cs
index 52f858c..eb2f8d6 100644
--- a/src/Utils/ModelItemTransformHelper.cs
+++ b/src/Utils/ModelItemTransformHelper.cs
@@ -1,6 +1,7 @@
 using System;
 using Autodesk.Navisworks.Api;
 using NavisworksTransport.Utils.CoordinateSystem;
+using System.Numerics;
 
 namespace NavisworksTransport.Utils
 {
@@ -591,6 +592,74 @@ namespace NavisworksTransport.Utils
             LogIncrementalTransformActual(item, targetPosition, targetRotation);
         }
 
+        /// <summary>
+        /// 直接对当前显示结果施加宿主轴旋转增量，再补一段平移把业务跟踪点拉回目标点。
+        /// 不先构造 targetRotation，也不从 current/target 姿态反推 deltaRotation。
+        /// </summary>
+        public static void MoveItemIncrementallyByAxisRotationAndTranslation(
+            ModelItem item,
+            Point3D currentPosition,
+            Vector3 hostAxis,
+            double deltaAngleRadians,
+            Point3D targetPosition)
+        {
+            if (item == null)
+            {
+                throw new ArgumentNullException(nameof(item));
+            }
+
+            if (hostAxis.LengthSquared() < 1e-12f)
+            {
+                throw new ArgumentException("hostAxis must be non-zero.", nameof(hostAxis));
+            }
+
+            Vector3 normalizedHostAxis = Vector3.Normalize(hostAxis);
+            Rotation3D deltaRotation = new Rotation3D(
+                new UnitVector3D(normalizedHostAxis.X, normalizedHostAxis.Y, normalizedHostAxis.Z),
+                deltaAngleRadians);
+            Matrix3 deltaLinear = new Transform3D(deltaRotation).Linear;
+            Point3D rotatedCurrentPosition = new Point3D(
+                deltaLinear.Get(0, 0) * currentPosition.X + deltaLinear.Get(0, 1) * currentPosition.Y + deltaLinear.Get(0, 2) * currentPosition.Z,
+                deltaLinear.Get(1, 0) * currentPosition.X + deltaLinear.Get(1, 1) * currentPosition.Y + deltaLinear.Get(1, 2) * currentPosition.Z,
+                deltaLinear.Get(2, 0) * currentPosition.X + deltaLinear.Get(2, 1) * currentPosition.Y + deltaLinear.Get(2, 2) * currentPosition.Z);
+
+            Vector3D compensatedTranslation = new Vector3D(
+                targetPosition.X - rotatedCurrentPosition.X,
+                targetPosition.Y - rotatedCurrentPosition.Y,
+                targetPosition.Z - rotatedCurrentPosition.Z);
+
+            LogManager.Debug(
+                $"[模型纯增量旋转平移] {item.DisplayName} 当前=({currentPosition.X:F3},{currentPosition.Y:F3},{currentPosition.Z:F3}), " +
+                $"目标=({targetPosition.X:F3},{targetPosition.Y:F3},{targetPosition.Z:F3}), " +
+                $"Axis=({normalizedHostAxis.X:F4},{normalizedHostAxis.Y:F4},{normalizedHostAxis.Z:F4}), " +
+                $"Angle={deltaAngleRadians * 180.0 / Math.PI:F2}°, " +
+                $"旋后当前点=({rotatedCurrentPosition.X:F3},{rotatedCurrentPosition.Y:F3},{rotatedCurrentPosition.Z:F3}), " +
+                $"平移=({compensatedTranslation.X:F3},{compensatedTranslation.Y:F3},{compensatedTranslation.Z:F3})");
+
+            var doc = Application.ActiveDocument;
+            var modelItems = new ModelItemCollection { item };
+            LogGeometryLevelTransforms(item, "[模型纯增量旋转平移应用前][GeometryAPI]");
+
+            var toOrigin = Transform3D.CreateTranslation(new Vector3D(
+                -currentPosition.X,
+                -currentPosition.Y,
+                -currentPosition.Z));
+            doc.Models.OverridePermanentTransform(modelItems, toOrigin, false);
+
+            var rotationOnlyComponents = Transform3D.CreateTranslation(new Vector3D(0, 0, 0)).Factor();
+            rotationOnlyComponents.Rotation = deltaRotation;
+            var rotationOnly = rotationOnlyComponents.Combine();
+            doc.Models.OverridePermanentTransform(modelItems, rotationOnly, false);
+
+            var toTarget = Transform3D.CreateTranslation(new Vector3D(
+                targetPosition.X,
+                targetPosition.Y,
+                targetPosition.Z));
+            doc.Models.OverridePermanentTransform(modelItems, toTarget, false);
+
+            LogGeometryLevelTransforms(item, "[模型纯增量旋转平移应用后][GeometryAPI]");
+        }
+
         /// <summary>
         /// 读取物体当前实际几何姿态。
         /// 优先使用 ModelGeometry.ActiveTransform，因为 ModelItem.Transform 只反映原始设计变换。