diff --git a/Assets/Scripts/Core/StepManager.cs b/Assets/Scripts/Core/StepManager.cs
index d2838d1..f358c6b 100644
--- a/Assets/Scripts/Core/StepManager.cs
+++ b/Assets/Scripts/Core/StepManager.cs
@@ -218,6 +218,12 @@ public class StepManager : MonoBehaviour
         Debug.Log($"StepManager: Ping步进 -> {_pingStepIndex} (ping{pingIndex} second={secondClick})");
         OnStepChanged?.Invoke(_pingStepIndex);
     }
+    
+    public void SetPingStepIndex(int index)
+    {
+        _pingStepIndex = index;
+        Debug.Log($"StepManager: Ping彻底重置 -> {index}");
+    }
 
     public void DecrementPingStep()
     {
diff --git a/Assets/Scripts/Core/UndoManager.cs b/Assets/Scripts/Core/UndoManager.cs
index 3e65b7e..b1e8f53 100644
--- a/Assets/Scripts/Core/UndoManager.cs
+++ b/Assets/Scripts/Core/UndoManager.cs
@@ -32,22 +32,40 @@ public static class ActionHistory
         var item = History.Pop();
         Debug.Log($"[ActionHistory] Undo {item.Type} handler={(item.Handler != null ? item.Handler.name : "null")}, remaining={History.Count}");
         
-        // 如果遇到任何 Ping 的动作，就代表用户想重置整个包扎步骤
-        if (item.Type == ActionType.PingFirst || item.Type == ActionType.PingSecond)
+        if (item.Type == ActionType.PingSecond)
         {
-            // 1. 持续弹栈，直到把所有 Ping 相关的记录都清理掉
-            while (History.Count > 0 && (History.Peek().Type == ActionType.PingFirst || History.Peek().Type == ActionType.PingSecond))
+            // 如果在包扎(第二阶段)，则重置所有的包扎纱布，退回到所有骨折点发光的状态
+            while (History.Count > 0 && History.Peek().Type == ActionType.PingSecond)
+            {
+                History.Pop();
+            }
+
+            var allPings = Object.FindObjectsOfType<PingClickHandler>(true);
+            foreach (var p in allPings)
+            {
+                if (p.chanraoObject != null) p.chanraoObject.SetActive(false);
+                p.gameObject.SetActive(true);
+                p.ReEnableBorder();
+            }
+
+            var sm = Object.FindObjectOfType<StepManager>();
+            if (sm != null) sm.SetPingStepIndex(8); // 退回到 4 个底模已确认的状态 (Ping 阶段的第一半结束)
+            
+            return true;
+        }
+        else if (item.Type == ActionType.PingFirst)
+        {
+            // 如果在定位(第一阶段)，则重置所有的定位，退回到只有第一个点发光的状态
+            while (History.Count > 0 && History.Peek().Type == ActionType.PingFirst)
             {
                 History.Pop();
             }
 
-            // 2. 将场景里的所有 Ping 彻底重置
             var allPings = Object.FindObjectsOfType<PingClickHandler>(true);
             foreach (var p in allPings)
             {
                 if (p.chanraoObject != null) p.chanraoObject.SetActive(false);
                 
-                // pingIndex 为 0 的通常是第一个出现的物体 (ping.004)
                 if (p.pingIndex == 0)
                 {
                     p.gameObject.SetActive(true);
@@ -55,13 +73,12 @@ public static class ActionHistory
                 }
                 else
                 {
-                    p.UndoShow(); // 其他的全部隐藏
+                    p.UndoShow();
                 }
             }
 
-            // 3. 将 UI 的 Ping 进度清零
             var sm = Object.FindObjectOfType<StepManager>();
-            if (sm != null) sm.ResetPingStep();
+            if (sm != null) sm.SetPingStepIndex(0);
             
             return true;
         }
diff --git a/Assets/Scripts/Interaction/ChanraoTuibuHandler.cs b/Assets/Scripts/Interaction/ChanraoTuibuHandler.cs
index 59f1d72..bdf0fd6 100644
--- a/Assets/Scripts/Interaction/ChanraoTuibuHandler.cs
+++ b/Assets/Scripts/Interaction/ChanraoTuibuHandler.cs
@@ -99,7 +99,7 @@ public class ChanraoTuibuHandler : MonoBehaviour
         var smr = GetComponent<SkinnedMeshRenderer>(); if (smr != null) smr.enabled = false;
         foreach (var r in GetComponentsInChildren<Renderer>(true)) { if (_outlineMesh != null && r == _outlineMesh) continue; r.enabled = false; }
         if (_outlineMesh != null) _outlineMesh.enabled = true;
-        if (nextObject != null) nextObject.SetActive(false);
+        if (nextObject != null) { nextObject.SetActive(false); var p = nextObject.GetComponent<PingClickHandler>(); if (p != null) p.UndoShow(); }
         StopAllCoroutines();
         StartCoroutine(BlinkOutline());
     }
diff --git a/Assets/Scripts/Interaction/PingClickHandler.cs b/Assets/Scripts/Interaction/PingClickHandler.cs
index e966e1e..2f81191 100644
--- a/Assets/Scripts/Interaction/PingClickHandler.cs
+++ b/Assets/Scripts/Interaction/PingClickHandler.cs
@@ -84,11 +84,18 @@ public class PingClickHandler : MonoBehaviour
                 var allPings = Object.FindObjectsOfType<PingClickHandler>();
                 foreach (var p in allPings)
                 {
-                    p.ReEnableBorder();
+                    // 只有未被包扎过的 ping 才能重新亮起边框
+                    if (p._modelShown)
+                    {
+                        p.ReEnableBorder();
+                    }
                 }
                 Debug.Log($"[PingClick] {name} 是最后一个 ping，所有边框已重新激活！");
             }
-            Debug.Log($"[PingClick] {name} 模型显示, 激活 {nextPing?.name}");
+            
+            if (nextPing != null) Debug.Log($"[PingClick] {name} 模型显示, 激活 {nextPing.name}");
+            else Debug.Log($"[PingClick] {name} 模型显示, 激活下一个");
+            
             var sm = FindObjectOfType<StepManager>();
             if (sm != null) sm.RecordPingStep(pingIndex, false);
         }
@@ -124,7 +131,27 @@ public class PingClickHandler : MonoBehaviour
         }
     }
 
-    public void ReEnableBorder() { _isBlinking = true; if (_outlineMesh != null) { _outlineMesh.enabled = true; StopAllCoroutines(); StartCoroutine(BlinkOutline()); } }
+    public void ReEnableBorder() 
+    { 
+        // 如果它已经被隐藏（包扎完毕），则不应该重新激活边框！
+        var col = GetComponent<Collider>();
+        if (col != null && !col.enabled) return;
+
+        _isBlinking = true; 
+        if (_outlineMesh != null) 
+        { 
+            _outlineMesh.enabled = true; 
+            StopAllCoroutines(); 
+            StartCoroutine(BlinkOutline()); 
+        } 
+    }
+
+    public void DisableBorder()
+    {
+        _isBlinking = false;
+        if (_outlineMesh != null) _outlineMesh.enabled = false;
+        StopAllCoroutines();
+    }
 
     public void UndoSecondClick() 
     {