Abstract: Objective To investigate the clinical effects of hip arthroplasty plus composite reconstruction for periacetabular tumors. Methods The hip joint was reconstructed with total artificial hip， reconstruction plate， screws， wire and bone cement. The patients were followed up postoperatively. The functional assessment was conducted with the Musculoskeletal Tumor Society Rating Scale（MSTS）. Results Despite of 1 patient with sudden death due to bilateral pulmonary embolism， the rest were successfully operated. Twenty-three patients could basically walk properly with 11 cases of normal hip function and 10 cases of hip flexion function partially restored. There were 5 patients of delayed wound healing. Out of 2 patients with peroneal nerve injure， one got recovery at 6th month postoperative and one did not restore during the followup with the use of protective brace. The followup ranged 12 to 84 months with the median of 40.0 month and the follow-up rate reached 1000％. Two patients died and four recurred（2 patients died）， while 21 patients survived（13 cases of tumorfree survival, 8 cases survived with tumor）. The MSTS score was（23.8±9.2） with excellent rate of 87.0％（20／23）.Conclusion The hip function was good in patients with periacetabular tumors after hip arthroplasty plus composite reconstruction during short-time follow-up.