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Dynamic character of ball screw is the key factor which influences the machining accuracy of the numerical control (NC) machine tool.In order to improve the dynamic character of the NC machine tool, it is necessary to study the dynamic character of ball screw.In this paper, the kinematics of ball screw mechanism (BSM) is studied to expound the dynamic process of the drive, and the load disturbance is considered to analyze the contact deformation based on the hertzian contact theory.The velocity relationship of ball, screw and nut is analyzed, and the influence of the contact deformation on the dynamic character is simulated and experimented.The results show that the relationship between contact deformation which is affected by the material character, contact angle and the load is nonlinear.The contact deformation is the factor that cannot be ignored on the dynamic machining error of high speed and high precision.