In order to understand the law of deformation behavior in the process of cyclic closed-die forging(CCDF),to improve the preparation process and to lay the foundation for further industrial application,the finite element analysis was performed on CCDF by numerical simulation software Deform-3D. The features of temperature field,strain field,velocity field and stress field of the sample in die forging were discussed. The results show that the upsetting deformation of the upper end of billet is earlier than th...