diff --git a/CAPI/API/include/Communication.h b/CAPI/API/include/Communication.h
index b1e678a..dbcdf2e 100644
--- a/CAPI/API/include/Communication.h
+++ b/CAPI/API/include/Communication.h
@@ -10,7 +10,9 @@
 #include "structures.h"
 #include <thread>
 #include <mutex>
+#include <condition_variable>
 #include <queue>
+#include <atomic>
 #include "ConcurrentQueue.hpp"
 
 class Logic;
@@ -44,7 +46,6 @@ public:
 
     bool TryConnection(int64_t playerID);
     protobuf::MessageToClient GetMessage2Client();
-    bool HaveMessage2Client();
     void AddPlayer(int64_t playerID, THUAI6::PlayerType playerType, THUAI6::HumanType humanType, THUAI6::ButcherType butcherType);
 
     void ReadMessage(int64_t playerID);
@@ -54,6 +55,8 @@ private:
     bool haveNewMessage = false;
     protobuf::MessageToClient message2Client;
     ConcurrentQueue<std::pair<int64_t, std::string>> messageQueue;
+    std::mutex mtxMessage;
+    std::condition_variable cvMessage;
 };
 
 #endif
diff --git a/CAPI/API/src/Communication.cpp b/CAPI/API/src/Communication.cpp
index e189409..78d659f 100644
--- a/CAPI/API/src/Communication.cpp
+++ b/CAPI/API/src/Communication.cpp
@@ -2,6 +2,8 @@
 #include "utils.hpp"
 #include "structures.h"
 #include <thread>
+#include <mutex>
+#include <condition_variable>
 
 using grpc::ClientContext;
 
@@ -198,15 +200,13 @@ bool Communication::TryConnection(int64_t playerID)
 
 protobuf::MessageToClient Communication::GetMessage2Client()
 {
+    std::unique_lock<std::mutex> lock(mtxMessage);
+    cvMessage.wait(lock, [this]()
+                   { return haveNewMessage; });
     haveNewMessage = false;
     return message2Client;
 }
 
-bool Communication::HaveMessage2Client()
-{
-    return haveNewMessage;
-}
-
 std::optional<std::pair<int64_t, std::string>> Communication::GetMessage()
 {
     return messageQueue.tryPop();
@@ -242,7 +242,13 @@ void Communication::AddPlayer(int64_t playerID, THUAI6::PlayerType playerType, T
         auto MessageReader = THUAI6Stub->AddPlayer(&context, playerMsg);
 
         while (MessageReader->Read(&message2Client))
-            haveNewMessage = true;
+        {
+            {
+                std::lock_guard<std::mutex> lock(mtxMessage);
+                haveNewMessage = true;
+            }
+            cvMessage.notify_one();
+        }
     };
     std::thread(tMessage).detach();
 }
diff --git a/CAPI/API/src/logic.cpp b/CAPI/API/src/logic.cpp
index 3ce9a3a..9046c6d 100644
--- a/CAPI/API/src/logic.cpp
+++ b/CAPI/API/src/logic.cpp
@@ -187,58 +187,54 @@ void Logic::ProcessMessage()
         pComm->ReadMessage(playerID);
         while (gameState != THUAI6::GameState::GameEnd)
         {
-            if (pComm->HaveMessage2Client())
+            auto clientMsg = pComm->GetMessage2Client();  // 在获得新消息之前阻塞
+            logger->debug("Get message from server!");
+            gameState = Proto2THUAI6::gameStateDict[clientMsg.game_state()];
+            switch (gameState)
             {
-                logger->debug("Get message from server!");
-                auto clientMsg = pComm->GetMessage2Client();
-                gameState = Proto2THUAI6::gameStateDict[clientMsg.game_state()];
-                switch (gameState)
-                {
-                    case THUAI6::GameState::GameStart:
-                        logger->info("Game Start!");
-
-                        // 重新读取玩家的guid，guid确保人类在前屠夫在后
-                        playerGUIDs.clear();
-                        for (auto human : clientMsg.human_message())
-                            playerGUIDs.push_back(human.guid());
-                        for (auto butcher : clientMsg.butcher_message())
-                            playerGUIDs.push_back(butcher.guid());
-                        currentState->guids = playerGUIDs;
-                        bufferState->guids = playerGUIDs;
-
-                        LoadBuffer(clientMsg);
-
-                        AILoop = true;
-                        UnBlockAI();
-
-                        break;
-                    case THUAI6::GameState::GameRunning:
-                        // 重新读取玩家的guid，guid确保人类在前屠夫在后
-                        playerGUIDs.clear();
-                        for (auto human : clientMsg.human_message())
-                            playerGUIDs.push_back(human.guid());
-                        for (auto butcher : clientMsg.butcher_message())
-                            playerGUIDs.push_back(butcher.guid());
-                        currentState->guids = playerGUIDs;
-                        bufferState->guids = playerGUIDs;
-
-                        LoadBuffer(clientMsg);
-                        break;
-                    case THUAI6::GameState::GameEnd:
-                        AILoop = false;
-                        {
-                            std::lock_guard<std::mutex> lock(mtxBuffer);
-                            bufferUpdated = true;
-                            counterBuffer = -1;
-                        }
-                        cvBuffer.notify_one();
-                        logger->info("Game End!");
-                        break;
-                    default:
-                        logger->debug("Unknown GameState!");
-                }
+                case THUAI6::GameState::GameStart:
+                    logger->info("Game Start!");
+
+                    // 重新读取玩家的guid，guid确保人类在前屠夫在后
+                    playerGUIDs.clear();
+                    for (auto human : clientMsg.human_message())
+                        playerGUIDs.push_back(human.guid());
+                    for (auto butcher : clientMsg.butcher_message())
+                        playerGUIDs.push_back(butcher.guid());
+                    currentState->guids = playerGUIDs;
+                    bufferState->guids = playerGUIDs;
+
+                    LoadBuffer(clientMsg);
+
+                    AILoop = true;
+                    UnBlockAI();
+
+                    break;
+                case THUAI6::GameState::GameRunning:
+                    // 重新读取玩家的guid，guid确保人类在前屠夫在后
+                    playerGUIDs.clear();
+                    for (auto human : clientMsg.human_message())
+                        playerGUIDs.push_back(human.guid());
+                    for (auto butcher : clientMsg.butcher_message())
+                        playerGUIDs.push_back(butcher.guid());
+                    currentState->guids = playerGUIDs;
+                    bufferState->guids = playerGUIDs;
+
+                    LoadBuffer(clientMsg);
+                    break;
+                default:
+                    logger->debug("Unknown GameState!");
+                    break;
             }
         }
+        AILoop = false;
+        {
+            std::lock_guard<std::mutex> lock(mtxBuffer);
+            bufferUpdated = true;
+            counterBuffer = -1;
+        }
+        cvBuffer.notify_one();
+        logger->info("Game End!");
     };
     std::thread(messageThread).detach();
 }
@@ -428,8 +424,7 @@ const std::vector<int64_t> Logic::GetPlayerGUIDs() const
 bool Logic::TryConnection()
 {
     logger->info("Try to connect to server...");
-    bool result = pComm->TryConnection(playerID);
-    return result;
+    return pComm->TryConnection(playerID);
 }
 
 void Logic::Main(CreateAIFunc createAI, std::string IP, std::string port, bool file, bool print, bool warnOnly)