diff --git a/appsrc/baseservice/front_msg_processer/front_msg_processer.cpp b/appsrc/baseservice/front_msg_processer/front_msg_processer.cpp
index 5607000..ae58fdd 100644
--- a/appsrc/baseservice/front_msg_processer/front_msg_processer.cpp
+++ b/appsrc/baseservice/front_msg_processer/front_msg_processer.cpp
@@ -91,7 +91,7 @@ void FrontMsgProcesser::processMsg(shared_ptr<MsgProcessContext> cxt) {
       }
 
       if (int(cxt->receipt["ackcode"]) != 0) {
-        cxt->receipt["message"]    = fmt::format("[{}]", ecode2str(cxt->receipt["ackcode"]));
+        cxt->receipt["message"]    = fmt::format("{}", ecode2str(cxt->receipt["ackcode"]));
         cxt->receipt["extMessage"] = fmt::format("{}", cxt->ackcodeExtMessage);
       }
       if (cxt->rely.empty() == false) {
@@ -100,7 +100,7 @@ void FrontMsgProcesser::processMsg(shared_ptr<MsgProcessContext> cxt) {
 
     } catch (const appexception& e) {
       cxt->receipt["ackcode"]     = e.ecode;
-      cxt->receipt["message"]     = fmt::format("[{}]", ecode2str(cxt->receipt["ackcode"]));
+      cxt->receipt["message"]     = fmt::format("{}", ecode2str(cxt->receipt["ackcode"]));
       cxt->receipt["traceinfo"]   = fmt::format("{}", e.traceinfo);
       cxt->receipt["description"] = fmt::format("{}", e.description);
       cxt->receipt["fromClass"]   = fmt::format("{}", e.fromClass);
@@ -114,6 +114,6 @@ void FrontMsgProcesser::processMsg(shared_ptr<MsgProcessContext> cxt) {
   } else {
     logger->error("unknown command: {}", key);
     cxt->receipt["ackcode"] = err::kappe_cmd_not_support;
-    cxt->receipt["message"] = fmt::format("[{}]", ecode2str(cxt->receipt["ackcode"]));
+    cxt->receipt["message"] = fmt::format("{}", ecode2str(cxt->receipt["ackcode"]));
   }
 }