Abstract: In the past, a lot of researches were done on the dynamic analysis of pier with deck supported on open pilings, subjected to the actiow of ship impact, yet all these studies were only refered to the linear vibration. Recently, considering the extensive employ of anti-impact equipment-rubber fender (nonlinear spring),in this paper,the nonlinear dynamic response analysis method for complex systems (ship-fender-pier) is proposed, The stiffness matrix of the complex systems were derived, the rigid-boby modes preliminarily were separated use of Ritz transform. For the nonlinear dynamic equation the direct integration is adopted using spline Weighted Residual subdemain method. The piecewise linerrization-secant interation is also presented solving the numerical solution. Impact force of ship and dynamic stress of structure are giver. The numerical examples show that the effect are very good.