There are physiologic and pathologic causes of parallel leg squat limitations. Physiologic causes include poor flexibility. Pathologic causes include short Achilles tendon, muscle tension, synovitis, and osteoarthritis. Treatment includes medication, physical therapy and surgery. 1. Poor flexibility: Adhere to flexibility exercises such as yoga, and avoid strains by cycling gradually. 2. Short Achilles tendon: the causes include congenital and acquired. Minor short Achilles tendon can be physical therapy such as massage, hot packs, physical therapy, with exercise, may have improved. If the Achilles tendon is obviously short, seriously affecting the life of the Achilles tendon lengthening surgery can be considered for treatment. 3. Muscle tension: Sitting for a long time, excessive fatigue and mental stress may lead to muscle tension, especially the hip flexor muscle group. It can be improved by rest, stretching and massage. 4. Synovitis: caused by joint injuries, infections and other factors, can lead to limited joint movement. Physical therapy includes massage, compression bandages, and muscle exercises. Medication includes the use of non-steroidal anti-inflammatory drugs such as ibuprofen, vitamin D, and antibiotics. Arthroscopic surgery may also provide relief. 5. Osteoarthritis: destruction of joint cartilage or matrix. Physical therapy includes physiotherapy and immobilization. Drug treatment includes non-steroidal anti-inflammatory drugs such as ibuprofen, closed treatment drugs such as trimethoprim, etc. In severe cases, artificial joint replacement, arthrotomy, osteotomy, etc. may be performed. The causes of squatting limitation of the parallel leg also include lumbar disc herniation, rheumatism, rheumatoid, meniscus injury and so on. After excluding the physiological factors, it is recommended to go to the regular hospital in time, and give targeted treatment after the doctor clarifies the cause of the disease.