Taking Atmega 16 chip as the core control device, through testing the driver's alcoholicity to control the ignition switch to prevent drunk driving. The sound and light alarm circuit module was used to produce sound and light alarm when the alcohol level exceeded mark. At the same time, GPS positioning system and voice call system could notify position of the vehicle by the way of text message when the driver was tested to be drunk. This design brought convenience to the timely processing and reduced the incidence of traffic accidents. LCD display control unit of the design can display all information real-timely.%采用ATmega 16单片机作为核心控制器件,通过检测驾驶员的酒精含量是否超标来控制汽车的点火开关是否打开来杜绝酒后驾车；声光报警电路模块用于当其酒精含量超标时发出声光报警；同时,当系统测知饮酒驾驶员醉酒后,GPS定位系统及语音呼叫系统会以短信的方式通知车辆的位置,方便及时处理,降低了交通事故的发生率；设置的LCD显示控件进行所有信息的实时显示.
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