Abstract: In this paper, we focus on the effect of surface repulsive force on the collision efficiency of particle under the action of electric field. We first solve the dynamic equations of the compression and spring-back of particle-wall collision by using the Runge-Kutta method in Matlab, and then obtain the collision efficiency based on the integral of Maxwell speed distribution. The results indicate that the particle collision efficiency increases with the increasing of collision angle, and finally it will reach a critical value for the collision efficiency when particles are completely coagulated. In addition, we find that the particle collision efficiency will decrease when the surface repulsive force is considered, which illustrates that the surface repulsive force will partly hinder the coagulation of particles.