diff --git a/client/client.cpp b/client/client.cpp
index 63391b2..4f5e0f2 100644
--- a/client/client.cpp
+++ b/client/client.cpp
@@ -16,7 +16,6 @@ namespace fs = std::filesystem;
 CClient::CClient()
 {
     client_ = std::make_shared<CTcpClient>(io_context_);
-    supported_.push_back("Get");
     sleep_.set_timeout(5000);
 }
 CClient::~CClient()
@@ -60,7 +59,7 @@ void CClient::run(const std::string& ip, const std::string& port)
     hearts_ = std::thread([&]() { hearts(); });
     std::thread thread([&]() { io_context_.run(); });
 
-    CFrameBuffer* bf = new CFrameBuffer();
+    auto* bf = new CFrameBuffer();
     bf->type_ = TYPE_GET_ID;
     send_frame(bf);
     delete bf;
@@ -457,7 +456,7 @@ bool CClient::check_update_list(const std::string& content, std::map<std::string
     return valid;
 }
 
-bool CClient::down_update_file(std::map<std::string, std::string> files)
+bool CClient::down_update_file(const std::map<std::string, std::string>& files)
 {
     std::shared_ptr<CFrameBuffer> buf = std::make_shared<CFrameBuffer>();
     buf->tid_ = list_serve_id_;
@@ -519,7 +518,7 @@ void CClient::handle_frame(CFrameBuffer* buf)
             if (real.empty()) {
                 continue;
             }
-            if (real.find("[") == std::string::npos) {
+            if (real.find('[') == std::string::npos) {
 #ifdef _WIN32
                 mpinfo("FILE ==> {}", CCodec::u8_to_ansi(real));
 #else
@@ -527,15 +526,15 @@ void CClient::handle_frame(CFrameBuffer* buf)
 #endif
                 task_list_[index]->files.push_back(real);
             } else {
-                auto a = real.find_first_of("[") + 1;
-                auto b = real.find_first_of("]");
+                auto a = real.find_first_of('[') + 1;
+                auto b = real.find_first_of(']');
                 std::string str_index = real.substr(a, b - a);
                 index = std::stoi(str_index);
 
                 std::string backup = real;
                 backup.erase(0, b + 1);
-                auto aa = backup.find_first_of("[") + 1;
-                auto bb = backup.find_first_of("]");
+                auto aa = backup.find_first_of('[') + 1;
+                auto bb = backup.find_first_of(']');
                 std::string id = backup.substr(aa, bb - aa);
 
                 if (!task_list_.count(index)) {
@@ -590,7 +589,7 @@ void CClient::handle_frame(CFrameBuffer* buf)
             keys = buf->fid_;
         }
         if (!keys.empty()) {
-            ths_.emplace_back(std::thread([this, keys]() { send_file_data_th(keys.c_str()); }));
+            ths_.emplace_back([this, keys]() { send_file_data_th(keys.c_str()); });
         }
         break;
     }
@@ -767,13 +766,9 @@ void CClient::judget_down_active()
     }
 }
 
-CFileOpr::CFileOpr()
-{
-}
+CFileOpr::CFileOpr() = default;
 
-CFileOpr::~CFileOpr()
-{
-}
+CFileOpr::~CFileOpr() = default;
 
 std::vector<std::string> CFileOpr::get_file_list(const std::string& input)
 {
diff --git a/client/client.h b/client/client.h
index 9ccea83..f51926d 100644
--- a/client/client.h
+++ b/client/client.h
@@ -50,8 +50,8 @@ public:
     bool down_one_file(const std::string& id, const std::string& file, const std::string& local_dir = "");
     void report_trans_ret(TransState state, const std::string& key = "");
     bool request_update_list(const std::string& param);
-    bool check_update_list(const std::string& content, std::map<std::string, std::string>& files);
-    bool down_update_file(std::map<std::string, std::string> files);
+    static bool check_update_list(const std::string& content, std::map<std::string, std::string>& files);
+    bool down_update_file(const std::map<std::string, std::string>& files);
 
 private:
     bool send_frame(CFrameBuffer* buf);
@@ -73,7 +73,6 @@ private:
     bool downloading_{false};
     asio::io_context io_context_;
     std::shared_ptr<CTcpClient> client_;
-    std::vector<std::string> supported_;
     std::map<int, std::shared_ptr<DownClientInfo>> task_list_;
     std::shared_ptr<TransInfomation> down_;
     std::vector<std::thread> ths_;
diff --git a/client/config.cpp b/client/config.cpp
index a845dab..7a68a51 100644
--- a/client/config.cpp
+++ b/client/config.cpp
@@ -9,13 +9,9 @@ namespace fs = boost::filesystem;
 namespace fs = std::filesystem;
 #endif
 
-CServerConfig::CServerConfig()
-{
-}
+CServerConfig::CServerConfig() = default;
 
-CServerConfig::~CServerConfig()
-{
-}
+CServerConfig::~CServerConfig() = default;
 
 bool CServerConfig::baseInit()
 {
diff --git a/client/config.h b/client/config.h
index e724ab1..f91aae1 100644
--- a/client/config.h
+++ b/client/config.h
@@ -32,7 +32,7 @@ public:
     bool write_ini(const std::vector<TransmSet>& set);
     bool append_ini(const std::string& ip, long port);
     bool remove_ini(long num);
-    bool get_ini(const std::vector<TransmSet>& set, long num, TransmSet& use);
+    static bool get_ini(const std::vector<TransmSet>& set, long num, TransmSet& use);
 
 private:
     void gen_default_ini(const std::string& path);
diff --git a/net/net_base.cpp b/net/net_base.cpp
index 36c5cf8..f990e30 100644
--- a/net/net_base.cpp
+++ b/net/net_base.cpp
@@ -4,9 +4,7 @@ CTcpClient::CTcpClient(asio::io_context& io_context) : io_context_(io_context),
 {
 }
 
-CTcpClient::~CTcpClient()
-{
-}
+CTcpClient::~CTcpClient() = default;
 
 bool CTcpClient::connect(const std::string& host, const std::string& port)
 {
@@ -90,7 +88,7 @@ void CTcpClient::async_recv()
     });
 }
 
-bool CTcpClient::is_normal()
+bool CTcpClient::is_normal() const
 {
     return is_normal_;
 }
diff --git a/net/net_base.h b/net/net_base.h
index 5dbb5ce..2079f51 100644
--- a/net/net_base.h
+++ b/net/net_base.h
@@ -9,7 +9,7 @@ using namespace ofen;
 class CTcpClient : public std::enable_shared_from_this<CTcpClient>
 {
 public:
-    CTcpClient(asio::io_context& io_context);
+    explicit CTcpClient(asio::io_context& io_context);
     ~CTcpClient();
 
 public:
@@ -18,14 +18,14 @@ public:
     bool send(const char* data, int len);
     void register_func(ExFun_t&& f);
     void async_recv();
-    bool is_normal();
+    bool is_normal() const;
 
 private:
     asio::io_context& io_context_;
     asio::ip::tcp::socket socket_;
     std::mutex mutex_;
     CMutBuffer buffer_;
-    std::array<char, g_BuffSize> tmp_buf_;
+    std::array<char, g_BuffSize> tmp_buf_{};
     ExFun_t fun_;
     std::string remote_key_;
     bool is_normal_{true};
diff --git a/server/server.cpp b/server/server.cpp
index fdedc3a..5c0046a 100644
--- a/server/server.cpp
+++ b/server/server.cpp
@@ -3,7 +3,6 @@
 #include <of_util.h>
 
 using namespace ofen;
-constexpr int g_MaxCacheLen = 1024 * 1024 * 50;
 constexpr int check_idle_percycle = 1000 * 30;   // 毫秒
 constexpr int remove_after_time = 60;            // 秒
 CTcpServer::CTcpServer(asio::io_context& io_context) : io_context_(io_context), acceptor_(io_context)
@@ -31,7 +30,7 @@ bool CTcpServer::start(unsigned short port)
         mpdebug("Here are the local IP addresses you may use.");
         mpdebug("===========================================");
         int i = 1;
-        while (it != asio::ip::tcp::resolver::iterator()) {
+        while (!it.empty()) {
             asio::ip::address addr = it->endpoint().address();
             mpinfo("({}){}", i, addr.to_string());
             ++it;
@@ -233,7 +232,7 @@ void CTcpServer::accept_client()
                     can = true;
                 }
             }
-            if (can == false) {
+            if (!can) {
                 std::this_thread::sleep_for(std::chrono::minutes(1));
             } else {
                 client_threads_[client_key] = std::thread(&CTcpServer::th_client, this, socket, client_key);
@@ -243,7 +242,8 @@ void CTcpServer::accept_client()
     });
 }
 
-void CTcpServer::th_client(std::shared_ptr<asio::ip::tcp::socket> socket, const std::string& client_key)
+void CTcpServer::th_client(const std::shared_ptr<asio::ip::tcp::socket>& socket,
+                           const std::string& client_key)
 {
     std::shared_ptr<int> deleter(new int(0), [&](int* p) {
         std::unique_lock<std::shared_mutex> lock(cli_mut_);
@@ -253,7 +253,7 @@ void CTcpServer::th_client(std::shared_ptr<asio::ip::tcp::socket> socket, const
             client_threads_.at(client_key).detach();
             client_threads_.erase(client_key);
         }
-        mpwarn("{} client {} exit.", __FUNCTION__, client_key);
+        mpwarn("th_client deleter client {} exit.", client_key);
     });
 
     try {
@@ -277,7 +277,7 @@ void CTcpServer::th_client(std::shared_ptr<asio::ip::tcp::socket> socket, const
                 throw asio::system_error(error);
             }
 
-            cache->buffer_.push(cache->tmp_buf_.data(), length);
+            cache->buffer_.push(cache->tmp_buf_.data(), static_cast<int>(length));
             while (true) {
                 auto* frame = CTransProtocal::parse(cache->buffer_);
                 if (frame) {
@@ -304,7 +304,7 @@ void CTcpServer::th_client(std::shared_ptr<asio::ip::tcp::socket> socket, const
     }
 }
 
-bool CTcpServer::send_frame(std::shared_ptr<asio::ip::tcp::socket> socket, CFrameBuffer* buf)
+bool CTcpServer::send_frame(const std::shared_ptr<asio::ip::tcp::socket>& socket, CFrameBuffer* buf)
 {
     char* out_buf{};
     int out_len{};
diff --git a/server/server.h b/server/server.h
index 21c0b18..0b8e04e 100644
--- a/server/server.h
+++ b/server/server.h
@@ -49,8 +49,8 @@ private:
 
 private:
     void accept_client();
-    void th_client(std::shared_ptr<asio::ip::tcp::socket> socket, const std::string& client_key);
-    bool send_frame(std::shared_ptr<asio::ip::tcp::socket> socket, CFrameBuffer* buf);
+    void th_client(const std::shared_ptr<asio::ip::tcp::socket>& socket, const std::string& client_key);
+    bool send_frame(const std::shared_ptr<asio::ip::tcp::socket>& socket, CFrameBuffer* buf);
     void monitor_idle();
 
 private:
diff --git a/util/util.cpp b/util/util.cpp
index f4ac658..360e25d 100644
--- a/util/util.cpp
+++ b/util/util.cpp
@@ -4,12 +4,10 @@
 #include <thread>
 
 CTransProtocal::CTransProtocal()
-{
-}
+= default;
 
 CTransProtocal::~CTransProtocal()
-{
-}
+= default;
 
 /*
 【 transm TCP 数据协议 】
@@ -29,7 +27,7 @@ CFrameBuffer* CTransProtocal::parse(CMutBuffer& buffer)
     unsigned char tail[] = {0xFF, 0xFF};
 
     // 如果超出 1MB的内容都无法解析成功，则认为是有无效客户端参与链接。
-    size_t cur_len = static_cast<size_t>(buffer.get_len());
+    auto cur_len = static_cast<size_t>(buffer.get_len());
     if (cur_len > MAX_FRAME_SIZE) {
         buffer.clear();
         // 这里故意延迟。
@@ -108,7 +106,7 @@ void CTransProtocal::display_progress(float percent)
         return;
     }
     const int barWidth = 38;
-    int pos = barWidth * percent;
+    int pos = static_cast<int>(barWidth * percent);
 
     std::cout << "[";
     for (int i = 0; i < barWidth; ++i) {
@@ -126,8 +124,7 @@ void CTransProtocal::display_progress(float percent)
 }
 
 CFrameBuffer::CFrameBuffer()
-{
-}
+= default;
 
 CFrameBuffer::~CFrameBuffer()
 {