Flat feet, usually called ‘flat feet’. It has congenital flat feet and acquired flat feet. Congenital flat feet are mainly related to human genetic factors. Acquired flat feet are mainly caused by long-term overweight loads on the feet of adolescents during development: walking long distances or mountain roads as usual, the arch muscles are compressed, causing excessive ligament tension, resulting in relaxation of the body, and rest Insufficiency and undernutrition lead to flat feet due to chronic strain.