diff --git a/Runtime/GuruAdjust/Editor/Signature/AdjustSignatureHelper.cs b/Runtime/GuruAdjust/Editor/Signature/AdjustSignatureHelper.cs
index 0e05266..279b2ca 100644
--- a/Runtime/GuruAdjust/Editor/Signature/AdjustSignatureHelper.cs
+++ b/Runtime/GuruAdjust/Editor/Signature/AdjustSignatureHelper.cs
@@ -20,19 +20,19 @@ namespace Guru
                 bool res;
                 from = $"{files}/{AndroidLib}.f";
                 to = $"{Application.dataPath}/Plugins/Android/{AndroidLib}";
-                res = CopyFile(from, to);
+                res = CopyFile(from, to); // 无需覆盖
                 if (res) Debug.Log($"Copy <color=#88ff00>{AndroidLib} to {to}</color> success...");
                 from = $"{files}/{AndroidLib}.f.meta";
                 to = $"{Application.dataPath}/Plugins/Android/{AndroidLib}.meta";
-                CopyFile(from, to);
+                CopyFile(from, to);  // 无需覆盖
                 
                 from = $"{files}/{iOSLib}.f";
                 to = $"{Application.dataPath}/Plugins/iOS/{iOSLib}";
-                res = CopyFile(from, to); 
+                res = CopyFile(from, to);   // 无需覆盖
                 if (res) Debug.Log($"Copy <color=#88ff00>{iOSLib} to {to}</color> success...");
                 from = $"{files}/{iOSLib}.f.meta";
                 to = $"{Application.dataPath}/Plugins/iOS/{iOSLib}.meta";
-                CopyFile(from, to);
+                CopyFile(from, to);  // 无需覆盖
                 
                 AssetDatabase.Refresh();
             }
@@ -55,25 +55,25 @@ namespace Guru
             return Path.GetFullPath($"{Application.dataPath}/../Packages/com.guru.unity.sdk.core/Runtime/GuruAdjust/Editor/Signature");
         }
 
-        private static bool CopyFile(string source, string dest)
+        private static bool CopyFile(string from, string to, bool overwrite = false)
         {
-            if (File.Exists(source))
+            if (File.Exists(to) && !overwrite)
             {
-                if (!File.Exists(dest))
-                {
-                    File.Delete(dest);
-                }
-                else
-                {
-                    var destDir = Directory.GetParent(dest);
-                    if(!destDir.Exists) destDir.Create();
-                }
+                // 如果目标文件存在， 且不允许覆写， 则不进行拷贝
+                return false;
+            }
+            
+            if (File.Exists(from))
+            {
+                // 确保拷贝目录存在
+                var destDir = Directory.GetParent(to);
+                if(destDir != null && !destDir.Exists) destDir.Create();
                 
-                File.Copy(source, dest, true);
+                File.Copy(from, to, overwrite);
                 return true;
             }
            
-            Debug.Log($"<colo=red>File not found: {source}...</color>");
+            Debug.Log($"<colo=red>File not found: {from}...</color>");
             return false;
         }