Abstract: Objective: Creation of the computer model osteotom for surgical simulation about osteotomy on model of CDH. Methods: The image data of hip joint in child with CDH were obtained by SVCT. Putting reconstruction the model of osteotom with according to Marching Cubes method by the mode B+ tree. Make sure point of intersection between models and cutting model of CDH through looking incompletely back on B+ tree. Results: It is finished rudimental that planar cutting, spherical shape cutting, pick-up and splicing to 3D model of hip on arbitrary position. Conclusion: The reconstructed structureis fine and true and is interactive. The modeling and cutting methods were feasible and effective. It was possible to study computer analog osseous operation by the models.