Abstract: Investigation on blade damage by bird impact is of great importance in the development of modern aero engines.The high speed dynamics of the bird impact on blades has been studied analytically and experimentally.The response analysis of the bird impact on the blade is a geometrical and material non linear,transient large displacement problem.A program system for the non linear transient response analysis has been developed and the loading characteristics of the bird impact are outlined.Based on the sensibility analysis of structural response to loading,a simple effective loading model of the bird impact is presented.A computer program of model analysis for the bird impact on blades is developed.The calculational results show that the bird impact on the blade at the velocity about 200m/s can be characterized as compressible fluid.The normal impact experiments with artificial birds have been completed,and the course of the bird impact was recorded by the high speed photography.It is proved again that the bird colliding against the blade behaves like compressible fluid.