We studied the high frequency vibrator of the top drive system based on ADAMS. A parameterized simulation model of the axial rotation of gears and eccentric block is established, and dynamic change of the impact and the actual movement of the rotating components of the top drive system are analyzed. Then create a virtual prototype on the basis of that. It can obtain curves that some parameters change relative to time, such as the exciting force and the centroid position of eccentric block. Thus it achieves dynamic simulation analysis of virtual prototype of the top drive system.