diff --git a/paddle/fluid/distributed/fleet_executor/interceptor.cc b/paddle/fluid/distributed/fleet_executor/interceptor.cc
index 2bee99d183b996c3564eac14210968c666b56c0f..7a87e3e6a006de6d706ee5b3580066d303e219f2 100644
--- a/paddle/fluid/distributed/fleet_executor/interceptor.cc
+++ b/paddle/fluid/distributed/fleet_executor/interceptor.cc
@@ -42,9 +42,8 @@ bool Interceptor::EnqueueRemoteInterceptorMessage(
   // Called by Carrier, enqueue an InterceptorMessage to remote mailbox
   VLOG(3) << "Enqueue message: " << interceptor_message.message_type()
           << " into " << interceptor_id_ << "'s remote mailbox.";
-  remote_mailbox_mutex_.lock();
+  std::unique_lock<std::mutex> lock(remote_mailbox_mutex_);
   remote_mailbox_.push(interceptor_message);
-  remote_mailbox_mutex_.unlock();
   return true;
 }
 
diff --git a/paddle/fluid/distributed/fleet_executor/message_bus.cc b/paddle/fluid/distributed/fleet_executor/message_bus.cc
index 6853768c84839304d0fa536c2f2e229f61fc0584..0094dbd1f10a1acce1d31d94641e19fa416196c6 100644
--- a/paddle/fluid/distributed/fleet_executor/message_bus.cc
+++ b/paddle/fluid/distributed/fleet_executor/message_bus.cc
@@ -48,15 +48,25 @@ bool MessageBus::Send(const InterceptorMessage& interceptor_message) {
   int64_t src_id = interceptor_message.src_id();
   int64_t dst_id = interceptor_message.dst_id();
   if (IsSameRank(src_id, dst_id)) {
-    VLOG(3) << "Send a message from: " << src_id << " to " << dst_id
-            << " within a same rank.";
+    VLOG(3) << "Send a message from rank " << src_id << " to rank " << dst_id
+            << ", which are same ranks.";
     return SendIntraRank(interceptor_message);
   } else {
-    VLOG(3) << "Send a message from: " << src_id << " to " << dst_id
-            << " between different ranks.";
+    VLOG(3) << "Send a message from rank " << src_id << " to rank " << dst_id
+            << ", which are different ranks.";
 #if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE) && \
     !defined(PADDLE_WITH_ASCEND_CL)
-    return SendInterRank(interceptor_message);
+    int retry_time = 0;  // message bus will retry sending for 10 times
+    while (retry_time < 10) {
+      ++retry_time;
+      if (SendInterRank(interceptor_message)) {
+        VLOG(3) << "Message bus sends inter rank successfully with "
+                << retry_time << " times retries.";
+        return true;
+      }
+    }
+    VLOG(3) << "Message bus sends inter rank fail after 10 times retries.";
+    return false;
 #else
     PADDLE_THROW(platform::errors::Unavailable(
         "Fleet executor does not support sending message between different "
@@ -134,6 +144,7 @@ bool MessageBus::SendInterRank(const InterceptorMessage& interceptor_message) {
   brpc::Channel channel;
   brpc::ChannelOptions options;
   options.protocol = "baidu_std";
+  options.connect_timeout_ms = 1000;
   options.timeout_ms = 1000;
   options.max_retry = 5;
   PADDLE_ENFORCE_EQ(
@@ -149,11 +160,11 @@ bool MessageBus::SendInterRank(const InterceptorMessage& interceptor_message) {
       VLOG(3) << "Message bus: brpc sends success.";
       return true;
     } else {
-      VLOG(3) << "Message bus: InterceptorMessageService error.";
+      VLOG(4) << "Message bus: InterceptorMessageService error.";
       return false;
     }
   } else {
-    VLOG(3) << "Message bus: brpc sends failed with error text: "
+    VLOG(4) << "Message bus: brpc sends failed with error text: "
             << ctrl.ErrorText();
     return false;
   }