The vehicle control instruments based on 8051 SCM was mainly made of three sub-system modules: password protection system, alcohol detection system and anti-collision system of ultrasonic distance-measurement. The lock system designed a password with four decimal digits as its code. Alcohol detection system used gas sensors to detect the driver’s alcohol concentration of breath. The ultrasonic distance-measurement system took the ultrasonic wave’s propagation speed in the air as the known condition, according to the transmitting and receiving of the different time period, and calculated the launch point barrier to the actual distance, so it may effectively prevent the collision event’s occurrence. experiment shows that the controller overcomes the shortcomings of the traditional controller, which is function mono, low-precision, slow response, so that the new multi-function controller can be widely applied in the future.