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When a gun is fired, it is necessary to count the projectile quantity, but most of the existing statistical methods still remain in the manual stage, so it is necessary to use a gun counter that can count automatically.Using the counter to count the number of shots can not only help the shooter to evaluate the remaining life of the gun, but also prevent the shooter from secretly intercepting bullets, which is of great value to improving the quality of weapon maintenance and the efficiency of the intelligent management of guns and bullets in the shooting range.Combined with the structural characteristics of automatic rifle and the feature of two large backward impact when the gun is fired, according to the mechanical vibration induction recognition technology to count the number of ammunition fired by the gun, an inertial accelerometer switch is designed. Through Adams dynamic simulation, the dynamic response of the accelerometer switch is analyzed.It is found that the acceleration sensor switch can effectively extract the characteristics of gun shooting.Through Ansys finite element analysis, the structural strength of the acceleration induction switch is checked, and the selected materials meet the strength requirements.