The treatment of second degree meniscus injury can be categorized into non-surgical treatment and surgical treatment. 1. Non-surgical treatment: for stable marginal tears less than 5mm without other injuries, stable longitudinal meniscus tears and central free edge ≤3mm injuries, non-surgical treatment can be carried out first, which mainly involves joint braking and rehabilitation exercises. Joint braking can be done by plaster fixation or brace fixation, which usually lasts for 4~6 weeks. During this period, rehabilitation exercises are carried out under the guidance of professional rehabilitation doctors, mainly for the muscles around the knee joint. Some of the patients can get good results after non-surgical treatment. 2. Surgery: If symptoms such as knee pain, interlocking and popping occur again after conservative treatment, surgery should be considered. At present, most of the meniscus injuries can be repaired and excised arthroscopically, and the medial 2/3 meniscus injuries are difficult to heal due to the lack of blood supply, and partial excision is often taken; and the lateral meniscus tear is usually repaired by suture repair. For serious injuries that are difficult to repair, complete meniscectomy can be considered, but the decision should be made carefully. For second-degree meniscus injuries, it is recommended that patients go to the hospital as soon as possible and have their condition fully evaluated by a medical professional before choosing the most appropriate treatment.