diff --git a/star_lock/lib/blue/sm4Encipher/sm4.dart b/star_lock/lib/blue/sm4Encipher/sm4.dart
index 5c9392be..8cdc9f76 100644
--- a/star_lock/lib/blue/sm4Encipher/sm4.dart
+++ b/star_lock/lib/blue/sm4Encipher/sm4.dart
@@ -538,6 +538,6 @@ class SM4 {
     if (key != null) setKey(key);
     List<int> input = data;
     List<int> output = _crypto(input, SM4_DECRYPT, mode, iv);
-    return utf8.decode(output);
+    return output;
   }
 }