In order to better understand the contact bounce behavior of AC contactors, a differential equation of contact bounce motion was established and solved from the perspective of mechanical vibration. Through Adams/View AC contactor prototype model, the design of the contact system was optimized by combining the user-defined improved genetic algorithm with dynamic analysis software, and the corresponding mechanical parameters were selected as design variables. The results show that the contact bounce time and maximum displacement were reduced by 89% and 93%, respectively. Finally, the experimental results and simulation errors of the laser rangefinder were less than 2%, which verified the superiority and feasibility of the optimal design method that combined the genetic algorithm with ADAMS software in contactor parameter optimization.