Abstract: 【Abstract】 Objective To compare the efficacy of sacroiliac joint anterior approach with double reconstruction plate and computer assisted navigation percutaneous sacroiliac screw for treating Tile C1 pelvic fractures. Methods Fifty patients with pelvic Tile C1 fractures were randomly divided into two groups ( n=25 for each) in the orthopedic department of West China Hospital of Sichuan University from December 2012 to November 2014. Patients in group A were treated by sacroiliac joint dislocation with anterior plate fixation. Patients in group B were treated with computerized navigation for percutaneous sacroiliac screw. The operation duration, intraoperative blood loss, incision length, and postoperative complications (nausea, vomiting, pulmonary infection, wound complications, etc.) were compared between the two groups. The postoperative fracture healing time, postoperative patient satisfaction, and postoperative fractures MATTA scores (to evaluate fracture reduction), postoperative MAJEED function scores, and SF36 scores of the patients were also recorded and compared. Results No significant differences in baseline characteristics were found between the two groups of patients. All of the patients in both groups had their operations successfully completed. Patients in group B had significantly shorter operations and lower intraoperative blood loss, incision length and postoperative complications than those in group A ( P<0.05). Patients in group B also had higher levels of satisfaction than those in group A ( P<0.05). No significant differences were found between the two groups in postoperative followup time, fracture healing time, postoperative MATTA scores, postoperative MAJEED function scores and SF36 scores ( P>0.05). Conclusion Sacroiliac joint anterior approach with double reconstruction plate and computer assisted navigation percutaneous sacroiliac screws are both effective for treating Tile C1type pelvic fractures, with similar longterm efficacies. However, computer assisted navigation percutaneous sacroiliac screw has the advantages of less trauma, less bleeding, and quicker