diff --git a/src/timer.rs b/src/timer.rs
index a0f3c97..d25cd34 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -14,6 +14,7 @@ pub type TimerWp = Weak::<Rc::<RefCell::<TimerList>>>;
 pub type TimerCb = Box::<dyn FnMut (i32, Option<Vec<Rc::<dyn Any>>>)>;
 type TimerListListHeadRp = Rc::<RefCell::<crate::ListHead<TimerList>>>;
 type TimerListRp = Rc::<RefCell::<TimerList>>;
+type TimerListWp = Weak::<RefCell::<TimerList>>;
 
 pub struct TimerAttacher {
     timers: TimerListListHeadRp,
@@ -48,17 +49,17 @@ pub struct TimerList {
 
 pub struct Timer {
     free_timer_num: i32,
-    free_timer_list: Rc::<RefCell::<crate::ListHead<TimerList>>>,
-    running_timer: Weak::<RefCell::<TimerList>>,
+    free_timer_list: TimerListListHeadRp,
+    running_timer: TimerListWp,
     timer_tick: i64,
     get_tick_count: fn () -> i64,
     cache_timer_num: i32,
-    work_list: Rc::<RefCell::<crate::ListHead<TimerList>>>,
-    tv1: [Rc::<RefCell::<crate::ListHead<TimerList>>>; TVR_SIZE],
-    tv2: [Rc::<RefCell::<crate::ListHead<TimerList>>>; TVN_SIZE],
-    tv3: [Rc::<RefCell::<crate::ListHead<TimerList>>>; TVN_SIZE],
-    tv4: [Rc::<RefCell::<crate::ListHead<TimerList>>>; TVN_SIZE],
-    tv5: [Rc::<RefCell::<crate::ListHead<TimerList>>>; TVN_SIZE],
+    work_list: TimerListListHeadRp,
+    tv1: [TimerListListHeadRp; TVR_SIZE],
+    tv2: [TimerListListHeadRp; TVN_SIZE],
+    tv3: [TimerListListHeadRp; TVN_SIZE],
+    tv4: [TimerListListHeadRp; TVN_SIZE],
+    tv5: [TimerListListHeadRp; TVN_SIZE],
 }
 
 impl Timer {