diff --git a/src/CounterDrone.Core/Simulation/FrameDataStore.cs b/src/CounterDrone.Core/Simulation/FrameDataStore.cs
index bf9b1d1..4aa3357 100644
--- a/src/CounterDrone.Core/Simulation/FrameDataStore.cs
+++ b/src/CounterDrone.Core/Simulation/FrameDataStore.cs
@@ -14,6 +14,8 @@ namespace CounterDrone.Core.Simulation
         private string _taskId = string.Empty;
         public int RetentionDays { get; set; } = 180;
         public int BufferedFrameCount { get; private set; }
+        /// <summary>仿真刚结束时保留内存快照，支持快速回放。Flush 后自动清空。</summary>
+        public List<SimFrameRecord> LiveFrames { get; private set; } = new();
 
         public FrameDataStore(IPathProvider paths)
         {
@@ -25,6 +27,7 @@ namespace CounterDrone.Core.Simulation
         {
             _taskId = taskId;
             _buffer.Clear();
+            LiveFrames.Clear();
             BufferedFrameCount = 0;
         }
 
@@ -60,7 +63,7 @@ namespace CounterDrone.Core.Simulation
             {
                 var fr = _buffer[i];
                 var s = fr.Snapshot;
-                records.Add(new SimFrameRecord
+                var record = new SimFrameRecord
                 {
                     TaskId = _taskId, FrameIndex = fr.FrameIndex, Timestamp = fr.Timestamp,
                     EntityId = s.EntityId, EntityType = (int)s.EntityType,
@@ -72,8 +75,13 @@ namespace CounterDrone.Core.Simulation
                         Models.EntityType.Cloud => $"{{\"radius\":{s.CloudRadius:F1},\"opacity\":{s.CloudOpacity:F2},\"phase\":{s.CloudPhase},\"elapsed\":{s.CloudElapsed:F1}}}",
                         _ => "{}",
                     },
-                });
+                };
+                records.Add(record);
             }
+
+            // 保留一份在内存供快速回放
+            LiveFrames = records;
+
             _buffer.Clear();
 
             var dbPath = Path.Combine(_paths.GetFramesDir(), $"{_taskId}.db");
@@ -84,7 +92,7 @@ namespace CounterDrone.Core.Simulation
             db.InsertAll(records);
         }
         
-        public void Discard() { _buffer.Clear(); BufferedFrameCount = 0; }
+        public void Discard() { _buffer.Clear(); LiveFrames.Clear(); BufferedFrameCount = 0; }
 
         public List<SimFrameRecord> ReadFrames(string taskId, int fromFrame, int toFrame)
         {
diff --git a/src/Unity/Assets/Scripts/Managers/ReplayController.cs b/src/Unity/Assets/Scripts/Managers/ReplayController.cs
index 0d4e496..3a6f96f 100644
--- a/src/Unity/Assets/Scripts/Managers/ReplayController.cs
+++ b/src/Unity/Assets/Scripts/Managers/ReplayController.cs
@@ -7,7 +7,7 @@ using UnityEngine;
 
 namespace CounterDrone.Unity
 {
-    /// <summary>回放控制器 — 从帧数据库读取历史仿真数据</summary>
+    /// <summary>回放控制器 — 仿真刚结束时用内存数据快速回放，历史仿真从数据库读取</summary>
     public class ReplayController : MonoBehaviour
     {
         private FrameDataStore _frameStore;
@@ -23,9 +23,19 @@ namespace CounterDrone.Unity
             _frameStore = new FrameDataStore(_paths);
         }
 
-        public void LoadReplay(string taskId)
+        /// <summary>加载回放数据：优先使用传入的 frameStore 内存数据（仿真刚结束），否则读数据库</summary>
+        public void LoadReplay(string taskId, FrameDataStore frameStore = null)
         {
-            CurrentFrames = _frameStore.ReadFrames(taskId, 0, int.MaxValue);
+            if (frameStore != null && frameStore.LiveFrames.Count > 0)
+            {
+                _frameStore = frameStore;
+                CurrentFrames = _frameStore.LiveFrames;
+            }
+            else
+            {
+                _frameStore ??= new FrameDataStore(_paths);
+                CurrentFrames = _frameStore.ReadFrames(taskId, 0, int.MaxValue);
+            }
 
             TotalFrames = CurrentFrames.Count > 0
                 ? CurrentFrames.Max(f => f.FrameIndex) + 1
diff --git a/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs b/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
index 38dd87d..41d74c9 100644
--- a/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
+++ b/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
@@ -20,6 +20,7 @@ namespace CounterDrone.Unity
 
         private SimulationEngine _engine;
         private FrameDataStore _frameStore;
+        public FrameDataStore FrameStore => _frameStore;
         private IScenarioService _scenario;
         private IPathProvider _paths;
         private string _taskId;