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This paper analyzes the motion state and forces of the warship gun breechblock cam. Firstly, the method of driven cam locking the breechblock safely and reliably can be obtained through analyzing the force between the driven cam and breechblock. And then according to the geometry and motion relationships between the driving cam, driven cam and stopper, the angular range of cams and the instantaneous angular velocity of driven cam are obtained. Finally,with the specific velocity, the velocity-acceleration curve at the head of the driven cam can be obtained by simulating with the Adams software. It can ensure that the driven cam can make the part driven certain velocity in a short time and cannot deform plastically.