diff --git a/backend/include/bs-utility.h b/backend/include/bs-utility.h
index 9a92a4f..63bd8d2 100644
--- a/backend/include/bs-utility.h
+++ b/backend/include/bs-utility.h
@@ -96,9 +96,11 @@ class ReadWriteLock {
 };
 class SessionClass {
  public:
-  std::stack<std::string> login_stack;
+  std::stack<std::pair<std::string, int>> login_stack;
   std::string SessionToken;
   std::string OuthorizationKey;
+  SessionClass(std::string _SessionToken, std::string _OuthorizationKey)
+      : SessionToken(_SessionToken), OuthorizationKey(_OuthorizationKey) {}
 };
 
 void debugPrint();
@@ -158,4 +160,6 @@ enum OperationType {
   __Klog,
   __Kreport,
 };
+
+std::string GenerateRandomString(int length);
 #endif  // PROTECTOR_UTILITY_H
\ No newline at end of file
diff --git a/backend/include/engine.h b/backend/include/engine.h
index 5b1ece6..819c36e 100644
--- a/backend/include/engine.h
+++ b/backend/include/engine.h
@@ -18,6 +18,7 @@ class BookStoreEngineClass {
  public:
   BookStoreEngineClass() = delete;
   BookStoreEngineClass(std::string __config_dir, bool __is_server);
+  std::string QueryUserInfo(const std::string &user_name);
   std::vector<std::string> Execute(
       const std::string &cmd,
       std::stack<std::pair<std::string, int>> &login_stack);
diff --git a/backend/src/bs-utility.cpp b/backend/src/bs-utility.cpp
index 7f03bc4..5582d1f 100644
--- a/backend/src/bs-utility.cpp
+++ b/backend/src/bs-utility.cpp
@@ -1,5 +1,6 @@
 #include "bs-utility.h"
 
+#include <random>
 namespace BookStore_ZYM {
 std::mutex debug_Print_Mutex;
 bool shut_down = false;
@@ -78,4 +79,21 @@ void Respond(BlockingStringStream *output_ptr, std::string SessionToken,
   for (int i = 0; i < ret.size(); i++) (*output_ptr) << ret[i] << '\n';
   (*output_ptr).unreadlock();
   output_mutex.unlock();
+}
+
+std::string GenerateRandomString(int length) {
+  static std::random_device rd;
+  static std::mt19937 gen(rd());
+  static std::uniform_int_distribution<> dis(0, 61);
+  std::string ret;
+  for (int i = 0; i < length; i++) {
+    int x = dis(gen);
+    if (x < 10)
+      ret += '0' + x;
+    else if (x < 36)
+      ret += 'a' + x - 10;
+    else
+      ret += 'A' + x - 36;
+  }
+  return ret;
 }
\ No newline at end of file
diff --git a/backend/src/builtin-cli.cpp b/backend/src/builtin-cli.cpp
index fe6dc04..accec2f 100644
--- a/backend/src/builtin-cli.cpp
+++ b/backend/src/builtin-cli.cpp
@@ -26,7 +26,89 @@ void BookStoreMain(bool is_server, std::string config_dir) {
       if (BookStore_ZYM::shut_down) return;
     }
   } else {
-    throw FatalError("Server mode has not been implemented yet", 1);
+    // throw FatalError("Server mode has not been implemented yet", 1);
     std::unordered_map<std::string, SessionClass> session_map;
+    std::string cmd;
+    while (std::getline(std::cin, cmd)) {
+      if (cmd[1] == 'O')  //`#OpenSession [TempChannelID]`
+      {
+        std::string new_session_token = GenerateRandomString(10);
+        std::string new_outh_token = GenerateRandomString(16);
+        session_map[new_session_token] =
+            SessionClass(new_session_token, new_outh_token);
+        std::stringstream ss(cmd);
+        std::string temp_channel_id;
+        ss >> temp_channel_id;
+        ss >> temp_channel_id;
+        std::cout << temp_channel_id << " Init 1\n"
+                  << new_session_token << ' ' << new_outh_token << std::endl;
+      } else if (cmd[1] == 'S')
+        return;
+      else if (cmd[1] == 'C') {
+        std::stringstream ss(cmd);
+        std::string session_token, operation_token, authentic_key;
+        ss >> session_token;
+        ss >> session_token >> operation_token >> authentic_key;
+        if (session_map.find(session_token) == session_map.end()) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        if (session_map[session_token].OuthorizationKey != authentic_key) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        session_map.erase(session_token);
+        std::cout << session_token << ' ' << operation_token << " 0"
+                  << std::endl;
+      } else if (cmd[1] == 'W') {
+        std::stringstream ss(cmd);
+        std::string session_token, operation_token, authentic_key;
+        ss >> session_token;
+        ss >> session_token >> operation_token >> authentic_key;
+        if (session_map.find(session_token) == session_map.end()) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        if (session_map[session_token].OuthorizationKey != authentic_key) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        if (session_map[session_token].login_stack.size())
+          std::cout << session_token << ' ' << operation_token << " 1\n"
+                    << engine.QueryUserInfo(
+                           session_map[session_token].login_stack.top().first)
+                    << std::endl;
+        else {
+          std::cout << session_token << ' ' << operation_token
+                    << " 1\n[nobody] -1" << std::endl;
+        }
+      } else if (cmd[1] == 'R') {
+        std::stringstream ss(cmd);
+        std::string session_token, operation_token, authentic_key;
+        ss >> session_token;
+        ss >> session_token >> operation_token >> authentic_key;
+        if (session_map.find(session_token) == session_map.end()) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        if (session_map[session_token].OuthorizationKey != authentic_key) {
+          std::cout << session_token << ' ' << operation_token << " -1"
+                    << std::endl;
+          continue;
+        }
+        std::getline(std::cin, cmd);
+        auto ret = std::move(
+            engine.ExecuteRegister(cmd,
+                                   session_map[session_token].login_stack));
+        std::cout << session_token << ' ' << operation_token << " "
+                  << ret.size() << std::endl;
+        for (auto &line : ret) std::cout << line << std::endl;
+      }
+    }
   }
 }
\ No newline at end of file
diff --git a/backend/src/engine.cpp b/backend/src/engine.cpp
index c651cd9..6f7cc8a 100644
--- a/backend/src/engine.cpp
+++ b/backend/src/engine.cpp
@@ -451,4 +451,8 @@ std::vector<std::string> BookStoreEngineClass::ExecuteReport(
     return ret;
   }
   return std::vector<std::string>();
+}
+
+std::string BookStoreEngineClass::QueryUserInfo(const std::string &user_name) {
+  return user_name + std::to_string(user_data_base.GetPrevilege(user_name));
 }
\ No newline at end of file
diff --git a/docs/develop/总体设计文档.md b/docs/develop/总体设计文档.md
index 9f1573f..0a6ac3b 100644
--- a/docs/develop/总体设计文档.md
+++ b/docs/develop/总体设计文档.md
@@ -69,7 +69,7 @@ memoryriver类维护一个缓存，简单地缓存高频访问和连续访问；
 ### 前端向后端
 - `#OpenSession [TempChannelID]`：向调度模块申请一个新会话
 - `#CloseSession [SessionToken] [OperationToken] [OuthenticationKey]`：显示地告知调度模块停止某个会话
-- `#Request [SessionToken] [OperationToken] [OuthenticationKey] [UserCommand]`：向后端发送一个请求
+- `#Request [SessionToken] [OperationToken] [OuthenticationKey]\n[UserCommand]`：向后端发送一个请求
 - `#Who [SessionToken] [OperationToken] [OuthenticationKey]`：查询自己是谁和权限
 - `#ShutDownSystem`：关闭整个系统