Abstract:[Objective] To compare the clinical outcomes of the OCM approach and the direct lateral approach for total hip arthroplasty (THA).[Method] From January 2018 to January 2022 53 cases of total hip arthroplasty were performed. According to the results of preoperative doctor-patient communication 18 cases with OCM approach technique, and 35 cases with DLA approach technique. Compare the perioperative indicators of the two groups，the follow-up and imaging data. The Harris score were used to evaluate the improvement of joint function. [Results] There were no significant difference in the age ,length and weight between the two groups (P＞0.05). Operative time, the intraoperative blood loss, surgical incision length, drainage, postoperative time of getting out of bed, length of hospital stay of the observation group, VAS scale of the second day after operation were significantly better than those in the DLA group, but the operation time was length than the DLA group, and the differences were statistically significant（P ＜0.05）. In addition, the OCM group was significantly superior to the DLA group in term of Harris score and hip range of motion (ROM) at 1 month, while which all became not statistically significant between the two groups at the latest follow-up (P>0.05) . At 3 days postoperatively the OCM group was slightly superior to the DLA group in terms of bilateral limb length discrepancy (LLD) ,abduction angle and anteversion of the acetabular component placed, despite of the fact that no statistically significant differences were noticed in abovesaid imaging parameters between the two groups (P>0.05). [Conclusion] OCM approach minimally invasive total hip arthroplasty has the advantages of less trauma, rapid postoperative recovery, and high quality of prognosis, which is suitable for most patients with hip joint diseases.