Objective: In order to simulate the different angles of acetabular blocks that need to be adjusted during the operation, the optimal Angle was determined after analyzing the contact stress and contact area of cartilage around the hip joint, so as to provide an individual scheme for acetabular osteotomy.Methods: A finite element model of hip dysplasia and normal pelvis was established to analyze the morphological characteristics of the acetabulum and the causes of stress concentration.To simulate osteotomy for the dysplasia model, a total of 20 postoperative osteotomy models were obtained through the combination of different angles of acetabular block rotation and lateral rotation, and the differences of optimal results of the models under the simulated standing on one leg were compared and analyzed.Results: The maximum contact pressure of normal acetabular cartilage was 7.85MPa.The maximum contact pressure of dysplastic acetabular cartilage was 13.42mpa, and the optimal contact pressure after simulated osteotomy decreased to 8.49mpa, and the contact distribution was improved more significantly.Conclusion: This study showed that changing the anterior rotation Angle can significantly improve the contact pressure distribution and size and stay away from the preoperative lesion area, which has a positive impact on postoperative outcomes.In addition, a personalized osteotomy plan based on the actual situation of each patient before the operation is crucial for the surgical effect.