Artificial intelligence,as a modern invention,is the future development direction.He can automatically operates according to a pre-set mode in an environment where human management is not necessary.It can be applied to scientific exploration and so on.The avoidance of unmanned vehicle is one embodiment of such application.In this design,80C51 microcontroller is used as intelligent unmanned vehicle control system.Adopting ultrasonic sensors to detect obstacles on the road,then it can perform real-time signal acquisition,analysis and processing,when encounterring obstacles,trolley can adjust its speed adaptively,and automatically achieve parking and other obstacle avoidance function.The design has simple structure,it is easy to be realized,but it is highly intelligent,human oriented,partly embodys the intelligence of the design