The solid model and virtual prototype model are built. Kinematics, strength and rigidity analysis are completed with FEM simulation system of MSC.NASTRAN. The analysis results of stress, strain and displacement of finite element simulation are presented. The results of simulation were proved by vibration experiment. Based on the simulation and vibration experiment, the mechanics dynamical properties are proved, the main destroy form and locations are analyzed and indexed. The result shows that the rigidity and strengthen could meet the requirement of design of the motor. In the end, in order to satisfy the needs of kinds of clients, the effect of core length on the stress and displacement is also discussed through FEA simulation. Finally, an optimization structure of the Rotor of a vertical motor is given and analyzed, which has the guiding sense in the test and 0ptimizating for the rotor.