Abstract: For the problems of low surface quality and poor shape precision in short arc milling, the flow field simulation model is established and the effects of interelectrode pressure field and velocity field on the distribution of particles removal are analyzed while the discharge state of the particles at different positions between the poles is simulated. The simulation results are verified by single factor experiment. The results show that the removal particles are mainly distributed near the center hole and edge of the electrode under the influence of the gap negative pressure, so that the local electric field is concentrated, the amount and depth of the discharge pits in the middle area of milling groove are increased. The distribution state of the removal particles can be changed by increasing the flushing pressure and hence the surface quality and the shape precision of the workpiece are obviously improved.