char Timer_buf[] = "00";
char code LCD_line1[] = "jiaodu:  0  du ";
char weight_1[] = "";
改成：
char code LCD_line2[] = "Weight:   0kg ";
char Timer_buf[5];
char code LCD_line1[] = "jiaodu:  0  du ";
unsigned char weight_1[4];
沒固定長度的數組系統會默認給一個長的值。顯示不好控制。再加上你的W_LCD_STR()遍歷了整個數組。所有才會出現后面的亂碼。

修改一下45行代碼如下
char code LCD_line1[] = "jiaodu: 0du ";

修改一下試看
char code LCD_line1[] = "jiaodu: 0du ";

得空看看，你用什么板子？