diff --git a/src/UI/WPF/ViewModels/AnimationControlViewModel.cs b/src/UI/WPF/ViewModels/AnimationControlViewModel.cs
index 23ccaf3..aef1c3c 100644
--- a/src/UI/WPF/ViewModels/AnimationControlViewModel.cs
+++ b/src/UI/WPF/ViewModels/AnimationControlViewModel.cs
@@ -2444,28 +2444,6 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                 }
             }
 
-            var center = item.BoundingBox().Center;
-            var tp = new Vector3((float)center.X, (float)center.Y, (float)center.Z);
-            var rtp = Vector3.Transform(tp, overrideQ);
-            var id = Transform3D.CreateTranslation(new Vector3D(0, 0, 0)).Factor();
-            id.Rotation = new Rotation3D(overrideQ.X, overrideQ.Y, overrideQ.Z, overrideQ.W);
-            id.Translation = new Vector3D(center.X - rtp.X, center.Y - rtp.Y, center.Z - rtp.Z);
-            doc.Models.OverridePermanentTransform(modelItems, id.Combine(), true);
-
-            // 旋转后平移：底边贴地 + 用户上下偏移
-            var hst = CoordinateSystemManager.Instance.ResolvedType;
-            var newBounds = item.BoundingBox();
-            var newCenter = newBounds.Center;
-            var ps = CurrentPathRoute?.Points?[0];
-            double objectBottom = hst == CoordinateSystemType.YUp ? newBounds.Min.Y : newBounds.Min.Z;
-            double groundLevel = (hst == CoordinateSystemType.YUp ? ps.Y : ps.Z)
-                + UnitsConverter.ConvertFromMeters(_objectGroundLiftHeightInMeters);
-            var delta = new Vector3D(
-                ps.X - newCenter.X,
-                hst == CoordinateSystemType.YUp ? groundLevel - objectBottom : ps.Y - newCenter.Y,
-                hst == CoordinateSystemType.YUp ? ps.Z - newCenter.Z : groundLevel - objectBottom);
-            doc.Models.OverridePermanentTransform(modelItems, Transform3D.CreateTranslation(delta), false);
-
             // 把绝对贴地姿态转成"相对于 baseline 的 host 欧拉修正"。
             // PathAnimationManager 增量链从 CAD 姿态出发，需要扣除 CAD 自带 yaw + pathYaw。
             LocalEulerRotationCorrection resultCorrection;
@@ -2483,10 +2461,20 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                 resultCorrection = ObjectPassageProjectionOptimizer.CanonicalQuaternionToHostEulerCorrection(
                     correctionCanonQ, adapter.HostType);
             }
-            _pathAnimationManager?.SetObjectRotationCorrectionDirect(resultCorrection);
+
+            // ===== 第一步：调整物体的结果（姿态修正 + 上下偏移，路径无关）=====
             _objectRotationCorrection = resultCorrection;
             OnPropertyChanged(nameof(ObjectRotationCorrection));
 
+            // ===== 第二步：路径对齐（按路径语义定位到起点，各路径自己的处理）=====
+            // 不再手工"底边贴地"（Ground 语义，Free 不适用），改为走起点放置：
+            // Ground → 底面贴地+lift；Free → 中心在路径点+lift
+            if (_pathAnimationManager != null)
+            {
+                _pathAnimationManager.ApplyObjectStartPlacementRequest(
+                    ObjectStartPlacementRequest.CreateRotationCorrection(resultCorrection, _objectGroundLiftHeightInMeters));
+            }
+
             // 回写上下偏移：贴地时用实际包围盒贴地，但确认/动画后用 correction 重建姿态，
             // 旋转后物体底边位置会变。与自动调整同方法：应用 correction 重建→测量底边→算 lift，
             // 测量后用新 correction+lift 完整重建，使物体停留在贴地等价姿态。