Physiologic popping or meniscus injury can be considered, and further examination is recommended, as well as conservative treatments such as braking or surgical treatments. 1. Physiological popping: If there is only occasional popping in the knee joint when the knee is bent, but it is not accompanied by pain or activity disorder, then it is mostly considered to be physiological popping such as rupture of the gas compression in the joint cavity, which does not need treatment. 2. Pathological popping: if popping often occurs, accompanied by pain and other manifestations, there may be meniscus injury, synovitis, osteoarthritis, etc., it is recommended that further magnetic resonance imaging and other examinations, if the degree of mild, you can take braking, oral ibuprofen and other anti-inflammatory drugs such as analgesics and other conservative treatments. If further examination reveals that the damage is more serious, it is recommended that arthroscopic surgery, joint replacement and other treatments can be performed. Therefore, if physiological reasons are excluded, it is recommended to go to the hospital for further examination such as magnetic resonance imaging, and treat the cause of the problem under the guidance of the doctor.