Abstract: In this paper,the whole dynamic collision process between ship and offshore electric substation platform is simulated and analyzed based on three-dimensional potential flow theory.The effects of ship speed,equivalent stiffness of fender and ship tonnage on collision force are analyzed quantitatively.An empirical formula for calculating the collision force between ship and electric substation platform is put forward,and the applicability of the formula is verified by comparing it with the codes of other countries.The introduction of the nonlinear stiffness coefficient of fender greatly improves the calculation system of collision force.The effects of different fender material properties and layout methods on the anti-collision performance of offshore electric substation platforms are studied,and the selection and layout principle of fender for offshore electric substation platforms are put forward.Combined with the actual sea conditions of offshore wind power,the time-domain process of the collision between ship and the offshore electric substation platform is reproduced,which provides construction guidance for the actual project.