diff --git a/chat/knowledge/src/main/java/com/tencent/supersonic/knowledge/utils/FileHelper.java b/chat/knowledge/src/main/java/com/tencent/supersonic/knowledge/utils/FileHelper.java
index 219342925..46df71d81 100644
--- a/chat/knowledge/src/main/java/com/tencent/supersonic/knowledge/utils/FileHelper.java
+++ b/chat/knowledge/src/main/java/com/tencent/supersonic/knowledge/utils/FileHelper.java
@@ -14,7 +14,7 @@ import lombok.extern.slf4j.Slf4j;
 @Slf4j
 public class FileHelper {
 
-    public static final String FILE_SPILT = "/";
+    public static final String FILE_SPILT = File.separator;
 
     public static void deleteCacheFile(String[] path) throws IOException {