Often legs sitting cross-legged is a bad posture, may damage local blood vessels and nerves, damage to the knee ligaments and meniscus, and even damage to the lumbar spine, the body has certain hazards. 1. Damage to local blood vessels and nerves: often sitting with legs crossed, may compress the local blood vessels and nerves, can lead to lower extremity blood circulation disorders, edema and pain, compression of nerves lead to lower extremity numbness. 2. Damage to knee ligaments and meniscus: when sitting with legs crossed, the knee joint is in a state of tension and tension, resulting in obvious knee pain, easy to damage the anterior and posterior cruciate ligaments of the knee and meniscus, affecting the normal life and work. 3. Damage to the lumbar spine: sitting cross-legged for too long can cause lumbar spine injury, resulting in lumbar spine physiological curvature changes, lumbar muscle strain, affecting daily life. It is recommended to develop good habits and avoid bad sitting posture.