diff --git a/.clang-format b/.clang-format
index 402f22e..36e4997 100644
--- a/.clang-format
+++ b/.clang-format
@@ -11,7 +11,7 @@ ReflowComments: true
 SpacesBeforeTrailingComments: 3
 TabWidth: 4
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ColumnLimit: 80
+ColumnLimit: 130
 AllowShortBlocksOnASingleLine: Never
 AllowShortFunctionsOnASingleLine: None
 AllowShortEnumsOnASingleLine: false
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 751d02a..92d0128 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -93,6 +93,9 @@
         "xmemory": "cpp",
         "xstring": "cpp",
         "xtr1common": "cpp",
-        "xutility": "cpp"
+        "xutility": "cpp",
+        "mutex": "cpp",
+        "array": "cpp",
+        "chrono": "cpp"
     }
 }
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f88dd9..75fa448 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,5 +15,6 @@ message(STATUS "Compiler CXX ID: ${CMAKE_CXX_COMPILER_ID}")
 set(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib/${CMAKE_BUILD_TYPE})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE}/) 
 
+add_subdirectory(util)
 add_subdirectory(server-core)
-add_subdirectory(example)
\ No newline at end of file
+add_subdirectory(server)
\ No newline at end of file
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
deleted file mode 100644
index 1b793b3..0000000
--- a/example/CMakeLists.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-cmake_minimum_required(VERSION 3.16)
-
-project(example LANGUAGES CXX)
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
-find_package(wxWidgets CONFIG REQUIRED) 
-
-add_executable(server-core-use server-core-use.cxx)
-target_link_libraries(server-core-use PRIVATE server-core wx::net)
-set_target_properties(server-core-use PROPERTIES WIN32_EXECUTABLE TRUE)
\ No newline at end of file
diff --git a/example/server-core-use.cxx b/example/server-core-use.cxx
deleted file mode 100644
index 24e41cf..0000000
--- a/example/server-core-use.cxx
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <server-core.h>
-#include <iostream>
-
-class ConsoleApp : public wxApp
-{
-public:
-    bool OnInit() override;
-};
-
-bool ConsoleApp::OnInit()
-{
-    CServerCore server;
-    server.Init("127.0.0.1", 9897);
-    server.Run();
-    return false;
-}
-
-wxIMPLEMENT_APP(ConsoleApp);
\ No newline at end of file
diff --git a/server-core/CMakeLists.txt b/server-core/CMakeLists.txt
index 0603dac..533d398 100644
--- a/server-core/CMakeLists.txt
+++ b/server-core/CMakeLists.txt
@@ -12,5 +12,5 @@ server-core.cxx
 )
 
 add_library(server-core STATIC ${PSOURCES})
-target_link_libraries(server-core PRIVATE wx::net wx::core)
+target_link_libraries(server-core PRIVATE wx::net wx::core gutil)
 target_include_directories(server-core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/server-core/server-core.cxx b/server-core/server-core.cxx
index 6a905a5..0fc41bf 100644
--- a/server-core/server-core.cxx
+++ b/server-core/server-core.cxx
@@ -38,11 +38,46 @@ int CServerCore::Run()
 void CServerCore::OnServerEvent(wxSocketEvent& event)
 {
     if (event.GetSocketEvent() == wxSOCKET_CONNECTION) {
-        auto* cli = server_->Accept();
-        if (!cli) {
+        auto* cli_ptr = server_->Accept(true);
+        if (!cli_ptr) {
             return;
         }
-        wxString tmp("Nihao");
-        cli->Write(tmp.c_str(), tmp.size());
+        std::shared_ptr<wxSocketBase> cli(cli_ptr, [](wxSocketBase* ptr) { ptr->Destroy(); });
+        wxIPV4address peer_addr;
+        wxString id;
+        if (cli->GetPeer(peer_addr)) {
+            id.append(peer_addr.IPAddress());
+            id.append(":");
+            id.append(std::to_string(peer_addr.Service()));
+            wxLogMessage("New connection from %s", id);
+        }
+
+        bool can = false;
+
+        {
+            std::unique_lock<std::shared_mutex> lock(cli_mut_);
+            if (client_cache_.size() >= 100) {
+                can = false;
+                cli->Close();
+            } else {
+                auto cache = std::make_shared<ClientCache>();
+                cache->socket = cli;
+                cache->last_recv_time = std::chrono::high_resolution_clock::now();
+                auto now = wxDateTime::Now();
+                cache->online_time = wxString::Format("%s.%03ld", now.Format("%Y-%m-%d %H:%M:%S"), now.GetMillisecond());
+                client_cache_.emplace(id, cache);
+                can = true;
+            }
+        }
+
+        if (!can) {
+            std::this_thread::sleep_for(std::chrono::minutes(1));
+        } else {
+            client_thread_.emplace(id, std::thread(&CServerCore::th_client_thread, this, cli, id));
+        }
     }
 }
+
+void CServerCore::th_client_thread(const std::shared_ptr<wxSocketBase>& socket, const wxString& id)
+{
+}
diff --git a/server-core/server-core.h b/server-core/server-core.h
index 259e632..51e6ec3 100644
--- a/server-core/server-core.h
+++ b/server-core/server-core.h
@@ -1,11 +1,27 @@
 #ifndef SERVER_CORE_H
 #define SERVER_CORE_H
 
+#include <array>
+#include <chrono>
+#include <gutil.h>
 #include <memory>
-#include <wx/wx.h>
-#include <wx/socket.h>
+#include <mutex>
+#include <shared_mutex>
+#include <thread>
+#include <unordered_map>
 #include <wx/event.h>
 #include <wx/evtloop.h>
+#include <wx/socket.h>
+#include <wx/wx.h>
+
+using high_clock = std::chrono::time_point<std::chrono::high_resolution_clock>;
+struct ClientCache {
+    std::shared_ptr<wxSocketBase> socket{};
+    CMutBuffer buffer{};
+    std::array<char, MAX_BUFFER_SIZE> recv_buffer{};
+    wxString online_time;
+    high_clock last_recv_time{};
+};
 
 class CServerCore : public wxEvtHandler
 {
@@ -19,10 +35,15 @@ public:
 
 private:
     void OnServerEvent(wxSocketEvent& event);
+    void th_client_thread(const std::shared_ptr<wxSocketBase>& socket, const wxString& id);
 
 private:
     std::unique_ptr<wxSocketServer> server_{};
     wxWindowID server_id_{};
+    std::unordered_map<wxString, std::shared_ptr<ClientCache>> client_cache_{};
+    std::unordered_map<wxString, std::thread> client_thread_{};
+    std::shared_mutex cli_mut_;
+    wxString server_ip_;
 };
 
 #endif
\ No newline at end of file
diff --git a/server/CMakeLists.txt b/server/CMakeLists.txt
index e69de29..86a4217 100644
--- a/server/CMakeLists.txt
+++ b/server/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(server LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(wxWidgets CONFIG REQUIRED) 
+
+set(PSOURCES
+server.cxx
+server.h
+)
+
+add_executable(server ${PSOURCES})
+target_link_libraries(server PRIVATE server-core wx::net gutil)
+set_target_properties(server PROPERTIES WIN32_EXECUTABLE TRUE)
\ No newline at end of file
diff --git a/server/server.cxx b/server/server.cxx
index e69de29..1c76c6b 100644
--- a/server/server.cxx
+++ b/server/server.cxx
@@ -0,0 +1,11 @@
+#include "server.h"
+
+bool CServer::OnInit()
+{
+    server_core_ = std::make_unique<CServerCore>();
+    server_core_->Init("127.0.0.1", 8080);
+    server_core_->Run();
+    return true;
+}
+
+wxIMPLEMENT_APP(CServer);
\ No newline at end of file
diff --git a/server/server.h b/server/server.h
index e69de29..9d0de4d 100644
--- a/server/server.h
+++ b/server/server.h
@@ -0,0 +1,16 @@
+#ifndef SERVER_H
+#define SERVER_H
+
+#include <server-core.h>
+#include <memory>
+
+class CServer : public wxApp
+{
+public:
+    bool OnInit() override;
+
+private:
+    std::unique_ptr<CServerCore> server_core_;
+};
+
+#endif
\ No newline at end of file
diff --git a/util/CMakeLists.txt b/util/CMakeLists.txt
index e69de29..637db4a 100644
--- a/util/CMakeLists.txt
+++ b/util/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(gutil LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(PSOURCES
+gutil.h
+gutil.cxx
+)
+
+add_library(gutil STATIC ${PSOURCES})
+target_include_directories(gutil PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/util/gutil.cxx b/util/gutil.cxx
index e69de29..72ab63b 100644
--- a/util/gutil.cxx
+++ b/util/gutil.cxx
@@ -0,0 +1,47 @@
+#include "gutil.h"
+#include <algorithm>
+
+#ifdef min
+#undef min
+#endif
+
+void CMutBuffer::push(const char* data, int len)
+{
+    buffer_.insert(buffer_.end(), data, data + len);
+}
+
+int CMutBuffer::index_of(const char* data, int len, int start_pos)
+{
+    if (start_pos < 0 || start_pos >= static_cast<int>(buffer_.size()) || len <= 0) {
+        return -1;
+    }
+    auto it = std::search(buffer_.begin() + start_pos, buffer_.end(), data, data + len);
+    if (it != buffer_.end()) {
+        return std::distance(buffer_.begin(), it);
+    }
+    return -1;
+}
+
+const char* CMutBuffer::get_data() const
+{
+    return buffer_.data();
+}
+
+int CMutBuffer::get_len() const
+{
+    return static_cast<int>(buffer_.size());
+}
+
+void CMutBuffer::remove_of(int start_pos, int len)
+{
+    if (start_pos < 0 || start_pos >= static_cast<int>(buffer_.size()) || len <= 0) {
+        return;
+    }
+    auto end_pos = std::min(start_pos + len, static_cast<int>(buffer_.size()));
+    buffer_.erase(buffer_.begin() + start_pos, buffer_.begin() + end_pos);
+}
+
+void CMutBuffer::clear()
+{
+    buffer_.clear();
+}
diff --git a/util/gutil.h b/util/gutil.h
index e69de29..e62c53e 100644
--- a/util/gutil.h
+++ b/util/gutil.h
@@ -0,0 +1,26 @@
+#ifndef GUTIL_H
+#define GUTIL_H
+
+#include <mutex>
+#include <vector>
+
+constexpr int MAX_BUFFER_SIZE = 1024 * 1024 * 10;
+
+class CMutBuffer
+{
+public:
+    CMutBuffer() = default;
+
+public:
+    void push(const char* data, int len);
+    int index_of(const char* data, int len, int start_pos = 0);
+    const char* get_data() const;
+    int get_len() const;
+    void remove_of(int start_pos, int len);
+    void clear();
+
+private:
+    std::vector<char> buffer_;
+};
+
+#endif   // GUTIL_H
\ No newline at end of file