Abstract: Taking the vibrating pile driver as a typical example, the applications of vibration-friction to a class of similar machines were investigated. With the nonlinear dynamic model developed, the Runge-Kutta method was introduced into the numerical simulation of a vibrating pile driver to obtain the nonlinear dynamic characteristics of the system. The results revealed that the amplitude of pile increases to a certain extent with the amplitude and frequency of exciting force, and it decreases to a certain extent with the decreasing amplitude of exciting force. But the decreasing frequency of exciting force has no obvious influence on the amplitude of pile. The change in stiffness of the system will affect greatly the amplitude of pile.