diff --git a/src/timer.rs b/src/timer.rs
index 721fd09..30bbeb0 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -124,24 +124,19 @@ impl Timer {
     }
 
     fn clear(&mut self) {
-        let free_timer = |tv: &mut [TimerListListHeadRp]| {
-            for i in 0..tv.len() {
-                let head = &tv[i];
-                while !head.borrow().empty() {
-                    let timer = &head.borrow().first_entry().upgrade().unwrap();
-                    timer.borrow_mut().timer_entry.borrow_mut().del_init();
-                    if timer.borrow().attach_entry.borrow().empty() {
-                        timer.borrow().attach_entry.borrow_mut().del_init();
-                    }
+        let free_timer = |head: &mut TimerListListHeadRp| {
+            while !head.borrow().empty() {
+                let timer = &head.borrow().first_entry().upgrade().unwrap();
+                timer.borrow_mut().timer_entry.borrow_mut().del_init();
+                if timer.borrow().attach_entry.borrow().empty() {
+                    timer.borrow().attach_entry.borrow_mut().del_init();
                 }
             }
         };
-        //free_timer(&mut self.free_timer_list);
-        free_timer(&mut self.tv1);
-        free_timer(&mut self.tv2);
-        free_timer(&mut self.tv3);
-        free_timer(&mut self.tv4);
-        free_timer(&mut self.tv5);
+        self.traverse_timer_list(
+            &mut |timer_list: &mut TimerListListHeadRp| {
+                free_timer(timer_list);
+            });
     }
 
     fn new_timer_list(&mut self) -> Rc::<RefCell::<TimerList>> {