The flat foot is clinically called flat foot syndrome, which is what the people call flat foot. Flat foot incidence is very high, children and adolescents can often be encountered. Flat foot on the human body will have the following effects: 1, pain: flat foot patients usually walk more, uneven pressure distribution, the force where the force is small, should not be stressed where the force is large, resulting in the pressure should not be increased, joint inflammation, pain; 2, foot shape change: no arch, the patient will appear foot valgus deformity, causing walking gait changes, belong to the shape of the change; 3, gait changes and pain can affect the knee joint on the painful side, hip joint and even pelvic tilt and scoliosis, affecting the normal limb shape.