Rehabilitation training methods after meniscus injury are as follows: 1. When the patient’s symptoms reach relief, he can first practice functional exercises in bed. Exercises in bed are mainly divided into two categories, one is active exercise and the other is passive exercise. For active exercise, the patient is required to practice straight leg raising of the knee joint. Passive exercise requires the patient to passively move the knee joint with the help of cpm machine or family members to gradually restore the mobility of the knee joint. 2. After the doctor allows the patient to go down to the ground for weight-bearing activities, it is recommended that the patient first practice walking slowly on the flat road. After the patient can walk normally, it can be changed to practice walking or jogging underwater. In the underwater environment, the lower limbs are basically not weight-bearing, this time the knee joint can be weight-bearing conditions under the condition of the maximum intensity of exercise. 3, after the patient walks normally without problems, it is recommended that the patient can practice half squatting exercise of the knee joint. The so-called semi-squat exercise, refers to the patient can sit half squatting on the yoga ball, sustained semi-squatting, or the patient’s back leaning against the wall, the knee joints to maintain semi-squatting, generally about 30 seconds of time.