diff --git a/src/util/index.js b/src/util/index.js
index 900d1e3..0744372 100644
--- a/src/util/index.js
+++ b/src/util/index.js
@@ -104,7 +104,7 @@ function signRequest(config) {
         
         console.log("stringToSign:",stringToSign,config,config.url)
         config.headers["X-EDU-Timestamp"] = timenow;
-        config.headers["X-EDU-Signature"] = md5(base64Encode((stringToSign)));
+        config.headers["X-EDU-Signature"] = md5(((stringToSign)));
     } catch (error) {
         debugger
     }