Objective:To investegate the biomechanical effects of curing the dislocation of the hip by pelvis osteotomy. and provide a theoretical basis for clinical application. Method: Measure the compression stress. shear stress. iliac stress as well as down displacement of femoral head and acetabulum contact stress under different acetabulum exponents by applying experimental stress analysis on four full pelvis-hip-femora cadaver samples. Results: Show, under different acetabulum exponents, if the testing exponent is lower than 30°. there is no big difference between measured stress on femora and standard values (P>0.05), while if the exponent is higher than 30°, the measured stress increase fast, the difference between measured and standard values approached 15%, which fulfils the operation demands. The displacement of femora head behaves according similar rule and the contact stress concentration on hip has also been improved. Conclusion: Curing the dislocation of the hip by pelvis osteotomy not only suits biomechanical principle, but also it is a safe and secure shelf opration. it has certain clinical application.