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For the firing characteristics of automatic firearm, this paper presents a novel method of firing rate measurement based on high speed photography technology. Because of the same periodicity between the weapon automata motion and the firing, used the semiconductor laser as the test light source, used scotchlite retroreflector to make synchronous movement with automaton and reflecte the laser, used high speed camera to capture the moving images of reflected laser, and then used MATLAB to process the image sequece and get the displacement-time information of automata motion , finally calculated the firing rate. The actual test of automatic firearm simulator five bursts shows that the method is feasible.