Squatting knee pain is mainly considered for two reasons: 1, knee, patellofemoral arthritis or patellar subluxation, the main reason is that with age, knee degeneration, patellofemoral joint surface is worn or muscle strength imbalance, in the process of flexion of the knee joint led to the patellofemoral joint surface and femoral condyles there is significant pressure, resulting in joint pain and discomfort, in the process of squatting can hear the knee obvious 2. Injury to the posterior horn of the medial and lateral meniscus of the knee joint, caused by degenerative wear and tear of the knee joint or injury to the posterior horn of the medial and lateral meniscus, which causes pain when the knee joint is flexed and pulled. Grade I meniscus injuries can heal by resting, while grade II-III meniscus injuries, especially white zone injuries, require partial meniscus removal and repair through minimally invasive arthroscopic surgery to improve symptoms.