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In order to select the optimal rubber bullets for a certain type of anti-riot disperser of kinetic energy , trajectory model of rubber ball is established ; three factors affecting the choice of rubber ball projectile which are the influence of air resistance on trajectory, the size of domestic and foreign typical rubber bullets and terminal effect are analyzed. Using MATLAB simulation software to analyze the influence of air resistance on trajectory , the farthest range, flight time, kinetic energy and specific kinetic energy of 8 mm, 10 mm, 15 mm three kinds of different diameter and quality of rubber ball , the effects of specific kinetic energy and K value on ballistic characteristics and terminal effect are analyzed importantly; By analyzing and comparing, the diameter of 10 mm and the mass of 2 grams is the most suitable for a certain type of anti-riot disperser .Through analyzing the ballistic characteristics and end effect on the rubber bullets which diameter is 10 mm and the mass is 2 grams, under different emission angle, the results show that it has the ability to keep speed and have the characteristic of remote operational distance, high safety, providing theoretical support for the manufacture of a certain type of anti-riot disperser of kinetic energy.