When young children learn to walk, they tend to have a pronounced lumbar lordosis, and only later slowly return to normal lumbar lordosis. As an adult, there are several people prone to “water snake waist”. First of all, the long-term use of inappropriate sitting position, can cause such bad posture; there is a lack of muscle exercise, weak abdominal muscles, weak extensor muscles, hip joints can not be straight, there may be “water snake waist” performance; too obese people, due to the abdominal bulge, the body gravity center forward, increasing the lumbar spine convexity; pregnant women can also be due to Pregnant women can also be due to the gravity of the relationship, the pelvis slightly forward, thus increasing the lumbar lordosis. Therefore, in daily life, in order to prevent lumbar muscle strain, attention must be paid to avoid many bad postures. Especially for patients with poor health, it is important to strengthen the exercise for the specific body conditions. Pregnant women must know about the health care of pregnancy in order to avoid the development of chronic strain injury of the lumbar region.