The bolt-operating mechanism is the principle part of the launching system, and it is the main mechanism demonstrated in the design and research of the launching system. Compared with the traditional bolt-operating mechanism, the new bolt-operating mechanism is greatly improved on principle design and structure innovation. The method of dynamic analysis of multi-rigid-body cannot specifically analyze the structural strength of components on specific positions. Therefore, the rigid and flexible coupling method is used in the motion analysis of the bolt-operating mechanism. This paper establishes the rigid and flexible coupling model of the mechanism based on software ANSYS and ADAMS, verifing the rationality of the mechanism by comparing the curve of the breech-displacement and the stress curve of U3 test points in the simulation and experiment, and gives useful suggestions on the optimization design of the bolt-operating CAM.