Objective: To investigate the clinical effect of hip arthroscopy in the treatment of cam-type femoro acetabular impingement (FAI). Methods: Fifty-seven patients with cam-type FAI were divided into group A (with hip dislocation, 27 cases) and group B (with hip arthroscopy, 30 cases) according to different surgical methods. The general indexes of perioperative period, modified Harris score, hip flexion angle, 90 ° flexion range, postoperative curative effect, and α angle were compared between the two groups of patients. Results: The patients in both groups were followed up for 12 to 18 (15.13 ± 2.14) months. (1) The operation time and surgical incision in group B were significantly shorter than those in group A (P <0.05); the incidence of complications in B (3.33%) was significantly lower than that in group A (18.51%), and the differences were significant (P <0.05); (2) Postoperative modified Harris score, hip flexion angle, and 90 ° flexion range of the two groups of patients were increased compared with those before surgery, and group B was significantly higher than that of group A (P <0.05); Last follow-up after surgery the efficacy score of group B was significantly better than that of group A, (P <0.05). (3) The α angle of group B after operation was (45.61 ± 7.46 °), which was significantly better than that of group A (40.36 ± 6.58), and the difference was significant (P <0.05). Conclusion: Hip arthroscopic treatment of cam-type FAI has the advantages of less surgical trauma, smaller incisions, faster postoperative recovery, better patient acceptance and satisfaction, and is worthy of further clinical promotion and use.