diff --git a/dayandnight/mysnake.c b/dayandnight/mysnake.c
index 3a8ecda..fb19e35 100644
--- a/dayandnight/mysnake.c
+++ b/dayandnight/mysnake.c
@@ -26,6 +26,7 @@ void snake_entry(void *parameter)
     int snake_list[SNAKE_MAX][2] = {0};
     int snake_direction[4][2] = {{0, -1}, {-1, 0}, {0, 1}, {1, 0}}; // 上，左，下，右
     char snake_dirshow[4][7] = {"upup", "left", "down", "rigt"};
+    char tmp[10];
     int snake_head = 2, snake_tail = 0, former_head; // 蛇头，蛇尾
     int now_direction = 3;                           // 当前方向
     snake_list[1][0] = SNAKE_MAX / 2;
@@ -46,14 +47,17 @@ void snake_entry(void *parameter)
 
         new_direction = rand() % 3;
         now_direction = (now_direction+3+new_direction)%4;//防止反向,走回头路
-        lcd_show_string(20, 20, 16,snake_dirshow[now_direction]);
-        rt_thread_mdelay(1000);
+        snake_address(snake_list[snake_head][0], snake_list[snake_head][1], SNAKE_SIZE, BLACK);
         snake_address(snake_list[snake_tail][0], snake_list[snake_tail][1], SNAKE_SIZE, WHITE);
         former_head = snake_head;
         snake_head = (snake_head + 1) % (SNAKE_MAX);
         snake_tail = (snake_tail + 1) % (SNAKE_MAX);
-        snake_list[snake_head][0] = (snake_list[former_head][0] + snake_direction[now_direction][0]) % (SNAKE_MAX);
-        snake_list[snake_head][1] = (snake_list[former_head][1] + snake_direction[now_direction][1]) % (SNAKE_MAX);
-        snake_address(snake_list[snake_head][0], snake_list[snake_head][1], SNAKE_SIZE, BLACK);
+        snake_list[snake_head][0] = (snake_list[former_head][0] + snake_direction[now_direction][0]+SNAKE_MAX) % (SNAKE_MAX);
+        snake_list[snake_head][1] = (snake_list[former_head][1] + snake_direction[now_direction][1]+SNAKE_MAX) % (SNAKE_MAX);
+        sprintf(tmp,"(%d,%d)", snake_list[snake_head][0], snake_list[snake_head][1]);
+        rt_kprintf("head:%d,%d\n", snake_list[snake_head][0], snake_list[snake_head][1]);
+        lcd_show_string(20, 20, 16,snake_dirshow[now_direction]);
+        lcd_show_string(20+16*4, 20, 16,tmp);
+        rt_thread_mdelay(1000);
     }
 }