diff --git a/bsp/simulator/snake/snake.c b/bsp/simulator/snake/snake.c
index a3ec774459f73630de9373be8b1ac28e3e03c2a3..ae25352d1470590025de91d1eef46dd5c958254d 100644
--- a/bsp/simulator/snake/snake.c
+++ b/bsp/simulator/snake/snake.c
@@ -10,7 +10,7 @@
     }while(0)
 
 rt_list_t snake_head;
-SNAKE_DIR prevdir;
+SNAKE_DIR prevdir, newdir;
 
 static SNAKE_DIR dir_adjust(SNAKE_DIR dir)
 {
@@ -20,14 +20,14 @@ static SNAKE_DIR dir_adjust(SNAKE_DIR dir)
             ||  (SNAKE_DIR_RIGHT == prevdir && SNAKE_DIR_LEFT != dir)
        )
     {
-        prevdir = dir;
+        newdir = dir;
     }
     else
     {
         rt_kprintf("dirction change error\n\r");
     }
 
-    return prevdir;
+    return newdir;
 }
 
 static void across_XY(point_t *node, const map_t *map)
@@ -77,6 +77,10 @@ static SYS_STE node_update(snake_t *tail, const point_t *node, map_t *map)
     }
 
     map->range[node->y * map->width + node->x] = OVER;
+    
+    if (ret != OVER)
+        prevdir = newdir;
+
     return ret;
 }
 
diff --git a/bsp/simulator/snake/snake_gui.c b/bsp/simulator/snake/snake_gui.c
index 8cbf5a95266cdca9e8df5d71f1539fd18b925590..6e0ba91cd4bf4bb207a73d7ac8d6904b5e32af17 100644
--- a/bsp/simulator/snake/snake_gui.c
+++ b/bsp/simulator/snake/snake_gui.c
@@ -324,11 +324,16 @@ static rt_bool_t event_handler(struct rtgui_object *object, rtgui_event_t *event
 static void timeout(struct rtgui_timer *timer, void *parameter)
 {
     struct rtgui_widget *widget;
-
+    SYS_STE ret;
+    
     if (!map)
         return;
 
-    if (snake_step(run_state, map) == FOOD)
+    ret = snake_step(run_state, map);
+    if (OVER == ret)
+        return;
+
+    if (FOOD == ret)
     {
         snake_len++;
         if (snake_len >= (map->width * map->height) / 3)
@@ -350,7 +355,7 @@ static void timeout(struct rtgui_timer *timer, void *parameter)
 
         food_init(map, 1);
     }
-
+    
     widget = RTGUI_WIDGET(parameter);
     snake_update(widget);
 }