diff --git a/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollector.cs b/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollector.cs
index f0ad20b..d0e9803 100644
--- a/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollector.cs
+++ b/Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollector.cs
@@ -251,7 +251,7 @@ namespace YooAsset.Editor
 			// 检测原生文件是否合规
 			if (isRawFilePackRule)
 			{
-				string extension = StringUtility.RemoveFirstChar(System.IO.Path.GetExtension(assetPath));
+				string extension = EditorTools.RemoveFirstChar(System.IO.Path.GetExtension(assetPath));
 				if (extension == EAssetFileExtension.unity.ToString() || extension == EAssetFileExtension.prefab.ToString() ||
 					extension == EAssetFileExtension.fbx.ToString() || extension == EAssetFileExtension.mat.ToString() ||
 					extension == EAssetFileExtension.controller.ToString() || extension == EAssetFileExtension.anim.ToString() ||
diff --git a/Assets/YooAsset/Editor/AssetBundleCollector/DefaultPackRule.cs b/Assets/YooAsset/Editor/AssetBundleCollector/DefaultPackRule.cs
index 72eef45..8f6c462 100644
--- a/Assets/YooAsset/Editor/AssetBundleCollector/DefaultPackRule.cs
+++ b/Assets/YooAsset/Editor/AssetBundleCollector/DefaultPackRule.cs
@@ -40,7 +40,7 @@ namespace YooAsset.Editor
 	{
 		PackRuleResult IPackRule.GetPackRuleResult(PackRuleData data)
 		{
-			string bundleName = StringUtility.RemoveExtension(data.AssetPath);
+			string bundleName = PathUtility.RemoveExtension(data.AssetPath);
 			PackRuleResult result = new PackRuleResult(bundleName, DefaultPackRule.AssetBundleFileExtension);
 			return result;
 		}
@@ -125,7 +125,7 @@ namespace YooAsset.Editor
 			}
 			else
 			{
-				bundleName = StringUtility.RemoveExtension(collectPath);
+				bundleName = PathUtility.RemoveExtension(collectPath);
 			}
 
 			PackRuleResult result = new PackRuleResult(bundleName, DefaultPackRule.AssetBundleFileExtension);
diff --git a/Assets/YooAsset/Editor/EditorTools.cs b/Assets/YooAsset/Editor/EditorTools.cs
index a03830f..9cc3c2d 100644
--- a/Assets/YooAsset/Editor/EditorTools.cs
+++ b/Assets/YooAsset/Editor/EditorTools.cs
@@ -286,6 +286,18 @@ namespace YooAsset.Editor
 		#endregion
 
 		#region StringUtility
+		public static string RemoveFirstChar(string str)
+		{
+			if (string.IsNullOrEmpty(str))
+				return str;
+			return str.Substring(1);
+		}
+		public static string RemoveLastChar(string str)
+		{
+			if (string.IsNullOrEmpty(str))
+				return str;
+			return str.Substring(0, str.Length - 1);
+		}
 		public static List<string> StringToStringList(string str, char separator)
 		{
 			List<string> result = new List<string>();
@@ -303,7 +315,6 @@ namespace YooAsset.Editor
 			}
 			return result;
 		}
-
 		public static T NameToEnum<T>(string name)
 		{
 			if (Enum.IsDefined(typeof(T), name) == false)