diff --git a/multi_encoding_converter.py b/multi_encoding_converter.py
index 0e73256..3f3418b 100644
--- a/multi_encoding_converter.py
+++ b/multi_encoding_converter.py
@@ -6,16 +6,23 @@
     base_encode = "gbk"
 
     # 转换编码格式列表
-    convert_encode_list = ["utf8", "utf16", "gb2312", "gb18030"]
+    convert_encode_list = ["utf8", "gb2312", "gb18030"]
 
     # 开始转换
     base_path = Path("src") / base_encode
+    base_files = {file.name for file in base_path.glob("*.sas")}
+    
     for convert_encode in convert_encode_list:
         convert_path = Path("src") / convert_encode
         if not convert_path.exists():
             convert_path.mkdir(parents=True)
+        
+        # 删除 base_path 中已不存在的文件
+        for file in convert_path.glob("*.sas"):
+            if file.name not in base_files:
+                file.unlink()
+        
+        # 复制或更新 base_path 中的文件
         for file in base_path.glob("*.sas"):
             content = file.read_text(encoding=base_encode)
-            (Path(convert_path) / file.name).write_text(
-                content, encoding=convert_encode
-            )
+            (Path(convert_path) / file.name).write_text(content, encoding=convert_encode)
diff --git a/src/utf16/ass2.sas b/src/utf16/ass2.sas
deleted file mode 100644
index c69c161..0000000
Binary files a/src/utf16/ass2.sas and /dev/null differ
diff --git a/src/utf16/ass3.sas b/src/utf16/ass3.sas
deleted file mode 100644
index 542df15..0000000
Binary files a/src/utf16/ass3.sas and /dev/null differ