Objective A three dimensional finite element model of the revised total hip is established to study the stem stress distributions and to provide a theoretical foundation for the clinical practice. Methods The main mechanicel properties of the stem under different conditions of external loadings is calculated and analyzed in detail using ABAQUS finite element software. Results ① The stem stress increases as the load angle α increases under different boundary conditions and load conditions. ② The stem stress is significantly affected by boundary conditions. ③ All the stress values are in direct proportion to the load values, but the stress distribution curves change shape with respect to load value. Conclusion ① The patients after total hip replacement should avoid the activity of large range of motion of the hip joint(α<30°).② The stresses in all load conditions increase rapidly with load angle α(α>25°) increasing when only the lower third part of the stem is in contact with the bone, so the femur fracture or the stem rupture can easily take place if there is an accidental impact.③ When the stem is not in perfect contact with the human femur, the stem stress is still large even when the range of motion of the patient's hip joint is small.