Background: At present, there are many clinical studies on the impact of obesity on postoperative function following total hip arthroplasty, but their conclusions are different and even contradictory. As abdominal obesity (AO), which is closely related to obesity, we know very little about its impact on postoperative function following total hip arthroplasty.Methods: Sixty-four patients were included in this prospective randomized controlled trial. Divided them into AO group (WC ≥ 90 cm for men and ≥ 85 cm for women) and non-AO group (WC ≤ 90 cm for men and ≤ 85 cm for women). Preoperative assessment included numerical pain rating, the Oxford Hip Score, 6-minute walk test and repeated at 6,12 months postoperatively. Postoperative assessment included the anteversion and inclination of the acetabular prosthesis, satisfaction at 12 months.Results：The hip joint function of both groups has been significantly improved at 1 year postoperatively. No significant differences were found in hip pain or function between the AO and non-AO groups. However, AO patients had poorer walking capacity (p=0.001).Conclusion: AO does not increase the complications after THA, nor does it have a significant impact on the function after THA, but it seems to have a negative effect on the improvement of walking ability.