Objective Based on the design of a new type of hip prosthesis stem, the stress distribution differences in standing, walking, running and sitting postures were analyzed. Methods Based on human CT data, seven groups of hips joint models with different stems implanted were established, and the finite element analysis method were used to calculate the stress of the prosthetic stem and femur under multiple working conditions. Results Compared with the traditional prosthetic stem in the standing state, the stress peak value of the new prosthetic stem was reduced by 23%, and the femoral stress was reduced by 72％. The results of seven prosthetic stem height of 86.5mm was the most suitable for patients’ needs. The multi-working condition results show that the patient is in a sitting position, the handle bears the least stress and has a longer service life. Conclusions The newly constructed prosthetic stem helps prolong the life of the prosthesis and reduces the risk of bone damage. The created hip prosthesis model provides scientific theoretical support for the design of the later stem and postoperative rehabilitation of patients.