In order to study the influence of different closing phase angles on the closing performance of contactor, the finite element model of CJX1-63 contactor was established by Ansoft Maxwell. The dynamic characteristics of the model were simulated, and the effects of different closing phase angles on the core closing speed and closing time were obtained. Then, the function relationship between the two indexes and the closing phase angle was obtained by used MATLAB to fit the simulation data curve. Finally, the double-objective comprehensive evaluation function was constructed by used the efficiency coefficient method, and the optimal closing phase angle was obtained. Experiments showed that when the closing phase angle was optimized, the closing collision and contact bounce of contactor could be restrained and the closing performance could be greatly optimized.