To study the application value of metal reconstruction cup in the repair of hip joint with acetabular defect caused by loosening of acetabular cup prosthesis. Methods Twenty patients with initial total hip arthroplasty (THA) who underwent orthopedic surgery in our orthopaedics department from March 2012 to March 2014 were the subjects in this study. The acetabular bone defect was covered in the acetabular defect >50%, 48 males and 32 females, aged 51-77 years, mean (64.98±4.32), initial THA time 3~10 years, mean (5.91±1.21) years. All patients underwent metal reconstruction cup hip revision surgery. All patients were followed up for more than 2 years. Harris score was used for hip function evaluation before and after the last follow-up. Pain visual analogue (VAS) score was used to evaluate pain before, during and after the last follow-up. Symptoms, and calculate the complication by calculating the hip rotation center to the outside of the teardrop and the distance between the tears through the X-ray film. Results All patients underwent successful operation. The time of operation (118.32±21.44) min, the amount of bleeding (322.49±32.24) ml, the length of hospital stays (12.67±2.91) d, the mean follow-up (3.36±0.54) years, and the femur within 12 months after surgery. The greater trochanter extended osteotomy area was completely healed. 4 patients developed deep venous thrombosis (DVT), no incision infection, and loosening of the prosthesis. The Harris score at the last follow-up was significantly higher than that before surgery. The VAS scores of the follow-up pain were significantly decreased. The distance from the center of the hip to the outside of the teardrop was significantly increased, and the distance between the teardrops was significantly decreased. The difference was statistically significant (P<0.05). Conclusion The cupping prosthesis loosening combined with the larger acetabular defect has improved the hip function recovery and pain improvement after the metal reconstruction cup hip revision treatment.