[Objective] To introduce the surgical technique and clinical outcomes of threading lasso fixation for articular-sided partial-thickness tears of the supraspinatus tendon. [Methods] We collected data of 25 patients with articular-sided partial-thickness tears of the supraspinatus tendon who were treated between March 2016 and October 2018. Patients underwent arthroscopic repair of the tendon. High strength wire was passed through both sides of the proximal end of the articular-sided torn portion along the bursal-sided surface of the supraspinatus tendon, and form a lasso. Pulling the sutures, a lateral row of anchors was used to fix the sutures to the greater of the humerus .At the last follow-up,data were analyzed to evaluate the efficacy of the surgery. [Results] There were no post-operation complications. At the last follow-up, mean VAS score decreased from 5.43±1.21 before the surgery to 1.15±0.83 at the last follow-up (t=14.908, P<0.01), and the mean ASES score improved significantly from 51.64±6.47 to 89.32±5.27 (t=22.859, P<0.01). Mean UCLA score improved from 17.83±3.56 preoperatively to 32.31±1.45 (t=19.233, P<0.01). A statistically significant difference was observed in all scoring measures.[Conclusion] For patients with articular-sided partial-thickness tears of the supraspinatus tendon, arthroscopic repair using threading lasso fixation is a novel transtendinous technique. Tendon integrity is preserved in this method,which may result in improved function. Threading lasso fixation technique is an effective treatment.