A new bionic flapping wing mechanism was proposed in order to imitate the motion of eagles wing. UG solid modeling and kinematical simulating were performed to validate the feasibility of this mechanism. The virtual prototype of this mechanism was established through ADAMS, and the structure dynamic simulation analysis and optimization design were applied to the prototype. The optimized design aim of flapping wing mechanism was obtained, and the analysis results provide references for the fast manufacturing of actual flapping wing air vehicle and its development. 