In this paper

basic simplified formulae for relationship between impact force and ship-bow indentation were presented based on results of finite element analysis of ship-bow-rigid wall collisions

and these formulae could be used in application-oriented mass-spring system for simplified dynamical analysis of ship-bridge collision.With software LS-DYNA

impacting analysis of finite element method for four ships between 3000-50000 DWT（deadweight tonage） and with initial velocities from 1.0 m/s to 5.0 m/s was carried out and the sample curves of impacting force-bow indention relationship were obtained.Based on observation of the sample curves

a simplified formula of basic force-indention relationships were proposed

and function form of parameters in the formula was derived in the basis of statistical method.Results of finite element calculations of ship-bridge collision from different models show that the simplified formula for impact force-indention relationship can meet the need of simplified dynamic analysis of ship-bridge collision.