Abstract: In order to solve the problem of crack in TC4 forging process, the effects of deformation rate, deformation temperature and deformation amount on the damage value of forgings were studied by numerical simulation. The results show that when the deformation temperature is 1000℃ and the deformation amount is 50%, the deformation rate below or above 2 mm/s helps to reduce the damage value of forgings. Through the analysis of variance and range in orthogonal test,the significant influence of process parameters on forgings was determined. The optimum forging process parameters are forging temperature of 925℃, deformation rate of 1000 mm/s and deformation of 70%.