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Objective：To investigate the surgical indications and surgical techniques of revision total hip arthroplasty for the failed hemiarthroplasty. Methods：We retrospectively studied 56 cases(31 males and 25 females) of failed hemiarthroplasty at age of 64-75 years(average for 68years) receiving the revision total hip arthroplasty from Jun. 1997 to Jun. 2000. Among them, there were 29 cases with acetabular erosion, 14 cases with acetabular erosion and central dislocation of femoral head, 12 cases with stem loosening and 1 case with stem fracture. All the cases are revised in one stage and bone grafts are adopted when necessary. Results：49 cases were follow-up for average 7 years and 7 cases had lost. The mean Harris score increased from 37.0 preoperatively to 87.5 at last follow-up. No wound infection and neurovascular injury happened. Only 5 perioperative complications occurred, including 3 deep venous thrombosis, 1 dislocation and 1 cortical fracture. No cups or femoral stems needed re-revision surgery. Radiographic analysis showed that the position of the artificial prosthesis was unchanged and no loosening sign existed. Conclusions：The acetabular erosion and central dislocation of femoral head are the main reasons for revision total hip arthroplasty after hemiarthroplasty. The medium-term follow-up results shows that the clinical effects are encouraging provided the surgical indications and surgical techniques are suitable.