The complex program monostable electronic control system has many input signals, constraints and interlocking conditions, resulting in a strong dependence on the designer in the design process, and difficulty in judging and eliminating interference signals. The shift register method does not require the designer to judge and eliminate the interference signal. Through reasonable classification, relationship diagram of series, signal elements and time sequence, the design of complex monostable electronic control system was realized. The simulation and experimental results show that this method has high design efficiency,the electrical circuit is simple in structure and has the advantages of uncomplicated and intuitive fault diagnosis and elimination, at the same time, the design cost is reduced and the economy and practicability can be improved.