diff --git a/Timer.java b/Timer.java
index fc13a84..e59fd44 100644
--- a/Timer.java
+++ b/Timer.java
@@ -2,19 +2,6 @@ package a6;
 
 public class Timer {
 
-    public class TimerList
-    {
-        private ListHead entry = new ListHead();
-        private ListHead attachEntry;
-        private int timerType = 0;
-        private int milli_seconds = 0;
-        private long expires = 0;
-
-        private ITimerFunc timerFunc;
-        private ITimerAfterFunc timerAfterFunc;
-        private XParams param;
-    }
-
     @FunctionalInterface
     public interface ITimerFunc
     {
@@ -27,11 +14,45 @@ public class Timer {
         public void OnTimerAfter(XParams param);
     }
 
+    @FunctionalInterface
+    public interface IGetTickCountFunc
+    {
+        public long GetTickCount(Object context);
+    }
+
+    public class TimerList
+    {
+        private ListHead entry = new ListHead();
+        private ListHead attachEntry;
+        private int timerType = 0;
+        private int milli_seconds = 0;
+        private long expires = 0;
+
+        private ITimerFunc timerFunc;
+        private ITimerAfterFunc timerAfterFunc;
+        private XParams param;
+
+        private void initTimerList(Timer timer, int timer_type, int milli_seconds,
+                                   XParams param, ITimerFunc timerFunc, ITimerAfterFunc afterFunc)
+        {
+
+        }
+    }
+
     private int freeTimerNum = 0;
     private ListHead freeTimer = new ListHead();
+    private TimerList runningTimer;
+    private long timerTick = 0;
+    private IGetTickCountFunc getTickCount;
+    private Object content;
+    private int gcTime = 0;
+    private int cacheTimerNum = 0;
 
-    public void init() {
-
+    public void init(IGetTickCountFunc func, Object content, int gc_time, int cache_timer_num) {
+        this.getTickCount = func;
+        this.content = content;
+        this.gcTime = gc_time;
+        this.cacheTimerNum = cache_timer_num;
     }
 
     public void unInit() {
@@ -43,30 +64,40 @@ public class Timer {
     }
 
     public TimerList addDeadLineTimer(int expire_time, XParams param, ITimerFunc timer_func) {
-        return null;
+        return addDeadLineTimer(expire_time, param, timer_func, null);
     }
 
     public TimerList addDeadLineTimer(int expire_time, XParams param, ITimerFunc timer_func,
                                  ITimerAfterFunc after_func) {
-        return null;
+        TimerList timer = newTimerList();
+        timer.initTimerList(this, 0, expire_time, param, timer_func, after_func);
+        return timer;
     }
 
     public TimerList addDeadLineTimerAndAttach(int expire_time, XParams param, ITimerFunc timer_func,
                                                TimerAttacher timer_attacher) {
-        return null;
+        return addDeadLineTimerAndAttach(expire_time, param, timer_func, timer_attacher, null);
     }
 
     public TimerList addDeadLineTimerAndAttach(int expire_time, XParams param, ITimerFunc timer_func,
                                                TimerAttacher timer_attacher, ITimerAfterFunc after_func) {
-        return null;
+        TimerList timer = addDeadLineTimer(expire_time, param, timer_func, after_func);
+        timer_attacher.addTimer(timer.attachEntry);
+        return timer;
     }
 
     public TimerList addRepeatTimer(int expire_time, XParams param, ITimerFunc timer_func) {
-        return null;
+        TimerList timer = newTimerList();
+        timer.initTimerList(this, 1, expire_time, param, timer_func, null);
+        modifyTimer(timer, expire_time);
+        return timer;
     }
 
     public TimerList addFixedTimer(int expire_time, XParams param, ITimerFunc timer_func) {
-        return null;
+        TimerList timer = newTimerList();
+        timer.initTimerList(this, 2, expire_time, param, timer_func, null);
+        modifyTimer(timer, expire_time);
+        return timer;
     }
 
     public void modifyTimer(TimerList timer_list, int expire_time) {
diff --git a/TimerAttacher.java b/TimerAttacher.java
index 568ab39..f03255f 100644
--- a/TimerAttacher.java
+++ b/TimerAttacher.java
@@ -2,6 +2,10 @@ package  a6;
 
 public class TimerAttacher {
 
+    public void addTimer(ListHead node) {
+
+    }
+
     public void clearTimer() {
 
     }