diff --git a/a8/asynctcpclient.cc b/a8/asynctcpclient.cc
index 552db50..3fdeccd 100644
--- a/a8/asynctcpclient.cc
+++ b/a8/asynctcpclient.cc
@@ -22,7 +22,6 @@ namespace a8
     AsyncTcpClient::AsyncTcpClient()
     {
         send_buffer_mutex_ = new std::mutex();
-        epoll_fd = a8::IoLoop::Instance()->epoll_fd;
     }
 
     AsyncTcpClient::~AsyncTcpClient()
@@ -87,6 +86,11 @@ namespace a8
         }
     }
 
+    void AsyncTcpClient::SetEpollFd(int epoll_fd)
+    {
+        epoll_fd_ = epoll_fd;
+    }
+
     void AsyncTcpClient::DoRecv()
     {
         if (socket_ == -1) {
@@ -136,7 +140,7 @@ namespace a8
         }
     }
 
-    void AsyncTcpClient::DoDisConnect()
+    void AsyncTcpClient::DoError()
     {
         connected_ = false;
         if (on_disconnect) {
@@ -187,7 +191,7 @@ namespace a8
             ev.data.fd = socket_;
             ev.events = EPOLLIN | EPOLLOUT | EPOLLRDHUP | EPOLLERR;
             ev.data.ptr = this;
-            int n = ::epoll_ctl(epoll_fd, EPOLL_CTL_ADD, socket_, &ev);
+            int n = ::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, socket_, &ev);
             assert(n == 0);
             if (n != 0) {
                 abort();
@@ -230,7 +234,7 @@ namespace a8
         ev.data.fd = socket_;
         ev.events = EPOLLIN | EPOLLOUT | EPOLLRDHUP;
         ev.data.ptr = this;
-        ::epoll_ctl(epoll_fd, EPOLL_CTL_MOD, socket_, &ev);
+        ::epoll_ctl(epoll_fd_, EPOLL_CTL_MOD, socket_, &ev);
     }
 
     void AsyncTcpClient::AsyncSend()
@@ -266,7 +270,7 @@ namespace a8
                         ev.data.fd = socket_;
                         ev.events = EPOLLIN | EPOLLRDHUP;
                         ev.data.ptr = this;
-                        ::epoll_ctl(epoll_fd, EPOLL_CTL_MOD, socket_, &ev);
+                        ::epoll_ctl(epoll_fd_, EPOLL_CTL_MOD, socket_, &ev);
                     }
                     send_buffer_mutex_->unlock();
                 }
diff --git a/a8/asynctcpclient.h b/a8/asynctcpclient.h
index 38661f7..eb61bb5 100644
--- a/a8/asynctcpclient.h
+++ b/a8/asynctcpclient.h
@@ -1,9 +1,11 @@
 #ifndef A8_ASYNC_TCPCLIENT_H
 #define A8_ASYNC_TCPCLIENT_H
 
+#include <a8/epolleventhandler.h>
+
 namespace a8
 {
-    class AsyncTcpClient
+    class AsyncTcpClient : public EpollEventHandler
     {
     public:
         std::function<void (a8::AsyncTcpClient*, int)> on_error;
@@ -23,12 +25,14 @@ namespace a8
         void SendBuff(const char* buff, unsigned int bufflen);
 
         void DoConnect();
-        void DoRecv();
-        void DoSend();
-        void DoDisConnect();
+
+        virtual void SetEpollFd(int epoll_fd) override;
+        virtual void DoRecv() override;
+        virtual void DoSend() override;
+        virtual void DoError() override;
 
     private:
-        volatile int epoll_fd = a8::INVALID_FD;
+        volatile int epoll_fd_ = a8::INVALID_FD;
         volatile int socket_ = a8::INVALID_SOCKET;
         volatile bool sending_ = false;
         volatile bool connected_ = false;
diff --git a/a8/epolleventhandler.h b/a8/epolleventhandler.h
new file mode 100644
index 0000000..0c3856d
--- /dev/null
+++ b/a8/epolleventhandler.h
@@ -0,0 +1,16 @@
+#ifndef A8_EPOLLEVENTHANDLER_H
+#define A8_EPOLLEVENTHANDLER_H
+
+namespace a8
+{
+    class EpollEventHandler
+    {
+    public:
+        virtual void SetEpollFd(int epoll_fd) = 0;
+        virtual void DoSend() = 0;
+        virtual void DoRecv() = 0;
+        virtual void DoError() = 0;
+    };
+}
+
+#endif
diff --git a/a8/eventfd.cc b/a8/eventfd.cc
new file mode 100644
index 0000000..62a8747
--- /dev/null
+++ b/a8/eventfd.cc
@@ -0,0 +1,59 @@
+#include <unistd.h>
+
+#include <sys/eventfd.h>
+
+#include <a8/a8.h>
+#include <a8/eventfd.h>
+
+namespace a8
+{
+
+    EventFD::EventFD()
+    {
+        fd_ = ::eventfd(0, 0);
+        if (fd_ == a8::INVALID_FD) {
+            abort();
+        }
+    }
+
+    EventFD::~EventFD()
+    {
+        ::close(fd_);
+        fd_ = a8::INVALID_FD;
+    }
+
+    void EventFD::Init(void* context)
+    {
+        context_ = context;
+    }
+
+    void EventFD::Write(unsigned long long value)
+    {
+        eventfd_write(fd_, value);
+    }
+
+    void EventFD::SetEpollFd(int epoll_fd)
+    {
+        epoll_fd_ = epoll_fd;
+    }
+
+    void EventFD::DoRecv()
+    {
+        eventfd_t value = 0;
+        ::eventfd_read(fd_, &value);
+        if (OnEvent) {
+            OnEvent(context_, value);
+        }
+    }
+
+    void EventFD::DoSend()
+    {
+        abort();
+    }
+
+    void EventFD::DoError()
+    {
+        abort();
+    }
+
+}
diff --git a/a8/eventfd.h b/a8/eventfd.h
new file mode 100644
index 0000000..e3a7ea6
--- /dev/null
+++ b/a8/eventfd.h
@@ -0,0 +1,30 @@
+#ifndef A8_EVENTFD_H
+#define A8_EVENTFD_H
+
+#include <a8/epolleventhandler.h>
+
+namespace a8
+{
+    class EventFD : public EpollEventHandler
+    {
+    public:
+        std::function<void (void*, unsigned long long)> OnEvent;
+
+        EventFD();
+        virtual ~EventFD();
+
+        void Init(void* context);
+        void Write(unsigned long long value);
+        virtual void SetEpollFd(int epoll_fd) override;
+        virtual void DoRecv() override;
+        virtual void DoSend() override;
+        virtual void DoError() override;
+
+    private:
+        int epoll_fd_ = a8::INVALID_FD;
+        void* context_ = nullptr;
+        int fd_ = a8::INVALID_FD;
+    };
+}
+
+#endif
diff --git a/a8/ioloop.cc b/a8/ioloop.cc
index bea4f4a..6f9b0c0 100644
--- a/a8/ioloop.cc
+++ b/a8/ioloop.cc
@@ -6,52 +6,147 @@
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <sys/epoll.h>
+#include <sys/eventfd.h>
 #include <netinet/tcp.h>
 
+#include <mutex>
 #include <thread>
 
 #include <a8/ioloop.h>
 #include <a8/asynctcpclient.h>
+#include <a8/eventfd.h>
+
+enum IoLoopIMMsg_e
+{
+   kFreeClient = 1
+};
 
 namespace a8
 {
 
-    void IoLoop::Init()
+    struct IoLoopThreadContext
     {
+        int epoll_fd = a8::INVALID_FD;
+        a8::EventFD event_fd;
+        std::mutex im_msg_mutex;
+        std::list<std::tuple<int, a8::XParams>> im_msg_list;
+    };
+
+    void IoLoop::Init(int thread_num)
+    {
+        if (thread_num < 1) {
+            abort();
+        }
+        thread_num_ = thread_num;
+        event_id_ = 1000;
         max_client_num_ = 10000;
-        epoll_fd = ::epoll_create(max_client_num_);
-        assert(epoll_fd != a8::INVALID_FD);
-        worker_thread_ = new std::thread(&a8::IoLoop::WorkerThreadProc, this);
+        for (int i = 0; i < thread_num; ++i) {
+            int epoll_fd = ::epoll_create(max_client_num_);
+            if (epoll_fd == a8::INVALID_FD) {
+                abort();
+            }
+            int event_fd = ::eventfd(0, 0);
+            if (event_fd == a8::INVALID_FD) {
+                abort();
+            }
+            IoLoopThreadContext* thread_context = new IoLoopThreadContext();
+            thread_context->epoll_fd = epoll_fd;
+            thread_context->event_fd.Init(thread_context);
+            thread_context->event_fd.SetEpollFd(epoll_fd);
+            std::thread* thread = new std::thread(&a8::IoLoop::WorkerThreadProc, this, thread_context);
+            worker_threads_.push_back(thread);
+            thread_contexts_.push_back(thread_context);
+        }
     }
 
     void IoLoop::UnInit()
     {
-        ::close(epoll_fd);
-        epoll_fd = a8::INVALID_FD;
-        delete worker_thread_;
-        worker_thread_ = nullptr;
+        worker_thread_shutdown_ = true;
+        for (int i = 0; i < thread_num_; ++i) {
+            worker_threads_[i]->join();
+            delete worker_threads_[i];
+            ::close(thread_contexts_[i]->epoll_fd);
+            delete thread_contexts_[i];
+        }
+        thread_contexts_.clear();
+        worker_threads_.clear();
     }
 
-    void IoLoop::WorkerThreadProc()
+    AsyncTcpClient* IoLoop::CreateAsyncTcpClient()
+    {
+        AsyncTcpClient* client =  new AsyncTcpClient();
+        client->SetEpollFd(thread_contexts_[(uintptr_t)client % thread_num_]->epoll_fd);
+        return client;
+    }
+
+    void IoLoop::DestoryAsyncTcpClient(AsyncTcpClient* client)
+    {
+        AddIMMsg(
+                 thread_contexts_[(uintptr_t)client % thread_num_],
+                 kFreeClient,
+                 a8::XParams()
+                 .SetSender(client)
+                 );
+    }
+
+    void IoLoop::WorkerThreadProc(IoLoopThreadContext* context)
     {
         epoll_event *events = new epoll_event[max_client_num_];
         while (!worker_thread_shutdown_) {
-            int nfds = ::epoll_wait(epoll_fd, events, max_client_num_, 1000 * 10);
+            ProcessIMMsg(context);
+            int nfds = ::epoll_wait(context->epoll_fd, events, max_client_num_, 1000 * 10);
             for (int i = 0; i < nfds; ++i) {
-                a8::AsyncTcpClient* session = (a8::AsyncTcpClient*)events[i].data.ptr;
+                a8::EpollEventHandler* handler = (a8::EpollEventHandler*)events[i].data.ptr;
                 if (events[i].events & EPOLLOUT) {
-                    session->DoSend();
-                } else if (events[i].events & EPOLLIN) {
-                    session->DoRecv();
-                } else if (events[i].events & EPOLLRDHUP ||
-                           events[i].events & EPOLLHUP ||
-                           events[i].events & EPOLLERR
-                           ) {
-                    session->DoDisConnect();
+                    handler->DoSend();
+                }
+                if (events[i].events & EPOLLIN) {
+                    handler->DoRecv();
+                }
+                if (events[i].events & EPOLLRDHUP ||
+                    events[i].events & EPOLLHUP ||
+                    events[i].events & EPOLLERR
+                    ) {
+                    handler->DoError();
                 }
             }
         }
         delete [] events;
     }
 
+    void IoLoop::AddIMMsg(IoLoopThreadContext* context, int imcmd, a8::XParams params)
+    {
+        context->im_msg_mutex.lock();
+        context->im_msg_list.push_back(std::make_tuple(
+                                                       imcmd,
+                                                       params
+                                                       ));
+        context->im_msg_mutex.unlock();
+        context->event_fd.Write(++event_id_);
+    }
+
+    void IoLoop::ProcessIMMsg(IoLoopThreadContext* context)
+    {
+        std::list<std::tuple<int, a8::XParams>> msg_list;
+        context->im_msg_mutex.lock();
+        if (!context->im_msg_list.empty()) {
+            context->im_msg_list.swap(msg_list);
+        }
+        context->im_msg_mutex.unlock();
+        if (!msg_list.empty()) {
+            for (auto itr = msg_list.begin(); itr != msg_list.end(); ++itr) {
+                int cmd = std::get<0>(*itr);
+                a8::XParams& param = std::get<1>(*itr);
+                switch (cmd) {
+                case kFreeClient:
+                    {
+                        AsyncTcpClient* client = (AsyncTcpClient*)param.sender.GetUserData();
+                        delete client;
+                    }
+                    break;
+                }
+            }
+        }
+    }
+
 }
diff --git a/a8/ioloop.h b/a8/ioloop.h
index 10e4806..fdb5687 100644
--- a/a8/ioloop.h
+++ b/a8/ioloop.h
@@ -1,12 +1,14 @@
 #ifndef A8_IOLOOP_H
 #define A8_IOLOOP_H
 
+#include <atomic>
 #include <a8/a8.h>
 #include <a8/types.h>
 
 namespace a8
 {
-
+    class AsyncTcpClient;
+    struct IoLoopThreadContext;
     class IoLoop : public a8::Singleton<IoLoop>
     {
     private:
@@ -14,17 +16,24 @@ namespace a8
         friend class a8::Singleton<IoLoop>;
 
     public:
-        void Init();
+        void Init(int thread_num);
         void UnInit();
-        volatile int epoll_fd = a8::INVALID_FD;
+
+        AsyncTcpClient* CreateAsyncTcpClient();
+        void DestoryAsyncTcpClient(AsyncTcpClient* client);
 
     private:
-        void WorkerThreadProc();
+        void WorkerThreadProc(IoLoopThreadContext* context);
+        void AddIMMsg(IoLoopThreadContext* context, int imcmd, a8::XParams params);
+        void ProcessIMMsg(IoLoopThreadContext* context);
 
     private:
-        int max_client_num_ = 1000;
+        std::atomic<unsigned long long> event_id_;
+        int thread_num_ = 1;
+        int max_client_num_ = 10000;
         volatile bool worker_thread_shutdown_ = false;
-        std::thread* worker_thread_ = nullptr;
+        std::vector<IoLoopThreadContext*> thread_contexts_;
+        std::vector<std::thread*> worker_threads_;
     };
 
 }
diff --git a/a8/timerfd.cc b/a8/timerfd.cc
new file mode 100644
index 0000000..6aab2ce
--- /dev/null
+++ b/a8/timerfd.cc
@@ -0,0 +1,84 @@
+#include <unistd.h>
+
+#include <sys/timerfd.h>
+
+#include <a8/a8.h>
+#include <a8/timerfd.h>
+
+namespace a8
+{
+
+    TimerFD::TimerFD()
+    {
+        fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
+        if (fd_ == a8::INVALID_FD) {
+            abort();
+        }
+    }
+
+    TimerFD::~TimerFD()
+    {
+        ::close(fd_);
+        fd_ = a8::INVALID_FD;
+    }
+
+    void TimerFD::Init(void* context)
+    {
+        context_ = context;
+    }
+
+    void TimerFD::Start(long long ms)
+    {
+        itimerspec new_value;
+
+        new_value.it_interval.tv_sec = 0;
+	new_value.it_interval.tv_nsec = ms * 1000 * 1000;
+
+	new_value.it_value.tv_sec = 0;
+	new_value.it_value.tv_nsec = ms * 1000 * 1000;
+
+        if (timerfd_settime(fd_, 0, &new_value, nullptr) != 0) {
+            abort();
+        }
+    }
+
+    void TimerFD::Stop()
+    {
+        itimerspec new_value;
+
+        new_value.it_interval.tv_sec = 0;
+	new_value.it_interval.tv_nsec = 0;
+
+	new_value.it_value.tv_sec = 0;
+	new_value.it_value.tv_nsec = 0;
+
+        if (timerfd_settime(fd_, 0, &new_value, nullptr) != 0) {
+            abort();
+        }
+    }
+
+    void TimerFD::SetEpollFd(int epoll_fd)
+    {
+        epoll_fd_ = epoll_fd;
+    }
+
+    void TimerFD::DoRecv()
+    {
+        unsigned long long value = 0;
+        ::read(fd_, &value, sizeof(value));
+        if (OnTimer) {
+            OnTimer(context_, value);
+        }
+    }
+
+    void TimerFD::DoSend()
+    {
+        abort();
+    }
+
+    void TimerFD::DoError()
+    {
+        abort();
+    }
+
+}
diff --git a/a8/timerfd.h b/a8/timerfd.h
new file mode 100644
index 0000000..5677b1e
--- /dev/null
+++ b/a8/timerfd.h
@@ -0,0 +1,31 @@
+#ifndef A8_TIMERFD_H
+#define A8_TIMERFD_H
+
+#include <a8/epolleventhandler.h>
+
+namespace a8
+{
+    class TimerFD : public EpollEventHandler
+    {
+    public:
+        std::function<void (void*, unsigned long long)> OnTimer;
+
+        TimerFD();
+        virtual ~TimerFD();
+
+        void Init(void* context);
+        void Start(long long ms);
+        void Stop();
+        virtual void SetEpollFd(int epoll_fd) override;
+        virtual void DoRecv() override;
+        virtual void DoSend() override;
+        virtual void DoError() override;
+
+    private:
+        int epoll_fd_ = a8::INVALID_FD;
+        void* context_ = nullptr;
+        int fd_ = a8::INVALID_FD;
+    };
+}
+
+#endif
diff --git a/a8/types.h b/a8/types.h
index f56afa2..c947814 100644
--- a/a8/types.h
+++ b/a8/types.h
@@ -3,28 +3,6 @@
 
 namespace a8
 {
-    namespace reflect
-    {
-        class Class;
-    }
-
-    struct ReflectibleObject
-    {
-        a8::reflect::Class *metaclass = nullptr;
-    };
-
-    struct IReflectible
-    {
-        virtual a8::ReflectibleObject* GetReflectibleObject() const = 0;
-        virtual void set(a8::ReflectibleObject* ) = 0;
-    };
-
-    template<class T>
-    struct DataLink
-    {
-        T* data = nullptr;
-    };
-
     typedef long long tick_t;
 
     struct SendQueueNode