Objective　To explore the operative strategy of internal fixations for complicated pelvic fractures using Mimics14.11 digital software combining with three-dimensional (3D) printing technique. Methods　Thin slice CT scan data of one case of complicated pelvic fractures and the data of all the pelvic internal fixations were imported into Mimics14.11 software to construct 3D models, performed virtual fractures reductions, established standard parts library of pelvis internal fixations, and chosen the most appropriate plates and screws.The 1:1 3D pelvic model was printed to simulate the surgery based on the digital design. Comparisons were made on the plate positions, screw passage lengths and screw directions to determine the final internal fixations. Finally, the fractures reductions and internal fixations were performed in the reality surgery.　Results　In the simulated surgery, 2 reconstruction plates and 15 screws were implanted, the plate positions and the screw directions were in high accordance with those measured in Mimics 14.11 software. The comparisons between simulated surgery and digital design on screw length had no significant difference (P>0.05). The effectiveness of reality surgery was also consist with the simulated surgery.　Conclusion　By using digital design software and three-dimensional (3D) printing technique, we can realize the individual operation and precise treatment which can achieve less blood loss and shorter hospital stay.