Abstract: Objective: To evaluate the clinical value of 3 dimensional reconstruction for multiplex spiral computer tomography (MSCT) in acetabulum fracture. Methods: 38 patients with acetabulum fracture examined by X-ray plain film and 3 dimensional reconstruction imaging were analysed retrospectively. Results: In 38 cases with acetabulum fracture, 34 patients were diagnosed accurately, 3 patients was suspected,and 1 patient was missed by X-ray plain film, 24 patients were classificated accurately by X-ray plain film. 38 patients with acetabulum fracture were diagnosed accurately and classificated by 3 dimensional reconstruction imaging. Conclusion: 3 dimensional reconstruction for multiplex spiral CT could clearly demonstrate the acetabulum fracture location, sizeand so on. 3 dimensional reconstruction for MSCT is better than X-ray, it plays an important role in the diagnosis of acetabulum fracture and in the surgical plan designing.