The mechanism of meniscus injury commonly includes three aspects: first, the knee joint is in a weight-bearing state; second, the knee joint is in a state of flexion; third, suffered from torsion, rotation violence, the three aspects will lead to meniscus injury. After the meniscus injury, we should avoid these three kinds of exercise, weight-bearing exercise, including going up and down stairs, squatting, mountain climbing, strenuous running are not allowed. Twisting violence, strenuous sports such as kicking a soccer ball, playing basketball, etc. are also not allowed. Prolonged knee flexion and extension activities are also detrimental to the knee joint, such as prolonged running exercise and prolonged walking are not allowed. After the knee meniscus injury, you can carry out the corresponding swimming exercise, and carry out functional exercise without weight bearing in bed, which are all conducive to the protection of the meniscus.