In order to obtain the law of contact bounce, the two degree of freedom piecewise coupled differential equation of contact system is simplified and evaluated. Using ADAMS view to establish the prototype model of AC contactor, combining the user-defined genetic algorithm with the dynamic analysis software ADAMS, selecting the mechanical parameters that have a great impact on the bounce time as the design variables, and optimizing the contact system design. The results show that the bounce time of contactor contact optimized by genetic algorithm is reduced by 89%. Finally, the experimental results and simulation errors of the laser rangefinder are less than 2%. The superiority and feasibility of the optimization design method based on genetic algorithm and ADAMS software in the optimization of contactor parameters are verified. The research results provide a new method for further comprehensive optimization of contactor prototype.