Purpose To investigate the method and clinical outcomes of arthroscopic treatment for discoid meniscus injury of minors. Methods From July 2010 to March 2017, 21 minor patients (22 knees) with discoid meniscus injury was hospitalized in our department, including 10 males and 11 females, with an average age of 12.3 years (range from 6-17). There were 12 cases of left knee, 8 cases of right knee, and 1 case of both knees. These patients endured for 3 days to 50 months before hospitalization. All patients underwent arthroscopic meniscus surgery after admission. The postoperative clinical outcomes was evaluated by Ikeuchi postoperative functional score system, and the preoperative and postoperative Lysholm score was compared to evaluate the postoperative functional improvement of injuried knees. Results All 21 patients were followed up at mean period of 28.5months (range from 12 to 41). Ikeuchi meniscus postoperative function scoring showed that: 17 knees (77.3%) were rated excellent, 4 knees (18.2%) were rated good and 1 knee (4.5%) were rated fair. There were no poor results. Moreover, preoperative Lysholm score was 67.7±12.8 (39-79) and postoperative Lysholm score was 96.8±3.2(90-100), The fuctiong of injuried ankles were significantly improved (P < 0.05). The complications, such as neurovascular injury, infection and deep vein thrombosis were not occurred. Conclusions Arthroscopic meniscus plasty, supplemented by the meniscus suture, has the advantage of small surgical trauma and quicker recovery. It is an ideal surgical treatment for discoid meniscus injury of minors with Satisfactory clinical outcomes. Early implementation of arthroscopic discoid meniscus plasty, to make it as far as possible to restore normal physiological functions, is conducive to reduce the occurrence of osteoarthritis and other degenerative diseases of the knee.