Abstract: In the process of introducing microprocessor programming, it is difficult for some students of electronic information specialty in the ordinary universities to design some engineering application program involving multi-state changes. A experimental teaching plan of traffic signal control based on finite state machine model is proposed In this paper. The principle and modeling of finite state machine, the state transition model of traffic signal lamp, the specific program flow and code implementation flow are described in detail. The practice of experimental teaching shows that the students' ability of the microprocessor programming with multi-state changes will be greatly improved after the comprehensive programming experiment training with this content. It can provide reference for the experimental teaching of microprocessor course for the student of non-computer specialty.