diff --git a/examples/example.c b/examples/example.c
index 0bdb510..2643521 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -51,8 +51,8 @@ int main(void)
     itimespec.it_interval.tv_sec = 1;
     itimespec.it_interval.tv_nsec = 0;
     
-    timer = TIMER_ADD(test, &itimespec, 8, timeout_handle, NULL);
-    TIMER_ADD(test, &itimespec, 3, timeout_handler, NULL);
+    timer = TIMER_ADD(test, &itimespec, 8, timeout_handle, NULL, NULL);
+    TIMER_ADD(test, &itimespec, 3, timeout_handler, NULL, NULL);
     printf("[%ld]:timer_add : %d\n", time(NULL), TIMER_COUNT(test));
     
     sleep(4);//getchar();
diff --git a/source/mt_timer.c b/source/mt_timer.c
index f625d60..fb28156 100644
--- a/source/mt_timer.c
+++ b/source/mt_timer.c
@@ -61,13 +61,13 @@ void timer_deinit(MT_TIMER_OBJECT *object)
     itimespec.it_interval.tv_sec = 0;
     itimespec.it_interval.tv_nsec = 0;
 
-    timer_add(object, &itimespec, 0, NULL, NULL);
+    timer_add(object, &itimespec, 0, NULL, NULL, NULL);
     pthread_join(object->timer_thread_id, NULL);
     timer_clear(object);
 }
 
 int timer_add(MT_TIMER_OBJECT *object, struct itimerspec *itimespec,
-                int repeat, timer_callback_t cb, void *data)
+                int repeat, timer_callback_t cb, void *data, timer_release_t rb)
 {
     struct epoll_event event;
     MT_TIMER_NODE *handler = NULL;
@@ -80,6 +80,7 @@ int timer_add(MT_TIMER_OBJECT *object, struct itimerspec *itimespec,
     }
     
     handler->timer_cb = cb;
+    handler->release_cb = rb;
     handler->timer_cnt = repeat;
     handler->timer_data = data;
     handler->timer_fd = timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC|TFD_NONBLOCK);
@@ -137,6 +138,8 @@ int timer_del(MT_TIMER_OBJECT *object, int timerfd)
     HASH_DEL(object->timer_head, handler);
     pthread_rwlock_unlock(&object->timer_rwlock);
     close(handler->timer_fd);
+    if(handler->release_cb)
+        handler->release_cb(handler->timer_data);
     free(handler);
     
     return 0;
@@ -165,6 +168,8 @@ int timer_clear(MT_TIMER_OBJECT *object)
         HASH_DEL(object->timer_head, handler);
         pthread_rwlock_unlock(&object->timer_rwlock);
         close(handler->timer_fd);
+        if(handler->release_cb)
+            handler->release_cb(handler->timer_data);
         free(handler);
     }
     return 0;
diff --git a/source/mt_timer.h b/source/mt_timer.h
index 6514a03..7e8abfa 100644
--- a/source/mt_timer.h
+++ b/source/mt_timer.h
@@ -70,6 +70,7 @@ typedef enum{false, true} bool;
 #define bool bool
 #endif
 
+typedef void (*timer_release_t)(void *data);
 typedef void (*timer_callback_t)(void *data);
 
 typedef struct {
@@ -78,6 +79,7 @@ typedef struct {
     void *timer_data;
     UT_hash_handle hh;
     timer_callback_t timer_cb;
+    timer_release_t release_cb;
 }MT_TIMER_NODE; /* MT mean multiple */
 
 typedef struct {
@@ -130,6 +132,8 @@ typedef struct {
                             HASH_DEL(mt_timer_##name.timer_head, timer_node); \
                             pthread_rwlock_unlock(&mt_timer_##name.timer_rwlock); \
                             close(timer_node->timer_fd); \
+                            if(timer_node->release_cb) \
+                                timer_node->release_cb(timer_node->timer_data); \
                             free(timer_node); \
                         } \
                     } \
@@ -142,7 +146,7 @@ typedef struct {
 extern int timer_init(MT_TIMER_OBJECT *object, void *(*thread_handler)(void *arg), int max_num);
 extern void timer_deinit(MT_TIMER_OBJECT *object);
 extern int timer_add(MT_TIMER_OBJECT *object, struct itimerspec *itimespec,
-                       int repeat, timer_callback_t cb, void *data);
+                       int repeat, timer_callback_t cb, void *data, timer_release_t rb);
 extern int timer_del(MT_TIMER_OBJECT *object, int timerfd);
 extern int timer_count(MT_TIMER_OBJECT *object);
 extern int timer_clear(MT_TIMER_OBJECT *object);
@@ -157,8 +161,8 @@ extern int timer_clear(MT_TIMER_OBJECT *object);
         timer_init(&mt_timer_##name, mt_timer_thread_##name, max)
 #define TIMER_DEINIT(name) \
         timer_deinit(&mt_timer_##name)
-#define TIMER_ADD(name, itimespec, repeat, cb, data) \
-        timer_add(&mt_timer_##name, itimespec, repeat, cb, data)
+#define TIMER_ADD(name, itimespec, repeat, cb, data, rb) \
+        timer_add(&mt_timer_##name, itimespec, repeat, cb, data, rb)
 #define TIMER_DEL(name, timerfd) \
         timer_del(&mt_timer_##name, timerfd)
 #define TIMER_COUNT(name) timer_count(&mt_timer_##name)