diff --git a/a8/timer.cc b/a8/timer.cc
index 4e889c5..8aaf396 100644
--- a/a8/timer.cc
+++ b/a8/timer.cc
@@ -243,6 +243,28 @@ namespace a8
         }
     }
 
+    a8::XParams* Timer::MutableParams(timer_list* timer)
+    {
+        if (!timer) {
+            abort();
+        }
+        return &timer->param;
+    }
+
+    long long Timer::GetRemainTime(timer_list* timer)
+    {
+        if (!timer) {
+            abort();
+        }
+        long long remain_time = a8::XGetTickCount() - timer->expires;
+        return std::max(remain_time, (long long)0);
+    }
+
+    timer_list* Timer::GetRunningTimer()
+    {
+        return base_->running_timer;
+    }
+
     int Timer::GetIdleableMillSeconds()
     {
         #if 0
diff --git a/a8/timer.h b/a8/timer.h
index 9695f2b..fc5b5fe 100644
--- a/a8/timer.h
+++ b/a8/timer.h
@@ -40,6 +40,12 @@ namespace a8
         void DeleteTimer(timer_list* timer);
         //通过关联的list_head获取定时器对象
         timer_list* GetTimerByAttach(list_head* attach_entry);
+        //获取定时器关联参数
+        a8::XParams* MutableParams(timer_list* timer);
+        //获取定时器剩余时间
+        long long GetRemainTime(timer_list* timer);
+        //获取当前正在运行的定时器
+        timer_list* GetRunningTimer();
         //获取定时器可怠速时间mill seconds
         int GetIdleableMillSeconds();
 
diff --git a/a8/xtimer.cc b/a8/xtimer.cc
index 7dba959..8b4dc23 100644
--- a/a8/xtimer.cc
+++ b/a8/xtimer.cc
@@ -262,6 +262,15 @@ namespace a8
         return &timer->param;
     }
 
+    long long XTimer::GetRemainTime(xtimer_list* timer)
+    {
+        if (!timer) {
+            abort();
+        }
+        long long remain_time = get_tick_count_func_(context_) - timer->expires;
+        return std::max(remain_time, (long long)0);
+    }
+
     xtimer_list* XTimer::GetRunningTimer()
     {
         return base_->running_timer;
diff --git a/a8/xtimer.h b/a8/xtimer.h
index fe5f8c6..e3d0602 100644
--- a/a8/xtimer.h
+++ b/a8/xtimer.h
@@ -40,7 +40,11 @@ namespace a8
         void DeleteTimer(xtimer_list* timer);
         //通过关联的list_head获取定时器对象
         xtimer_list* GetTimerByAttach(list_head* attach_entry);
+        //获取定时器关联参数
         a8::XParams* MutableParams(xtimer_list* timer);
+        //获取定时器剩余时间
+        long long GetRemainTime(xtimer_list* timer);
+        //获取当前正在运行的定时器
         xtimer_list* GetRunningTimer();
 
     private: