Foot and ankle doctors have three major tools, surgery, braces and functional exercises, and the most used braces are biomechanical corrective insoles (functional corrective insoles). The principle is to correct the abnormal force on the foot, compensate for the abnormal force on the foot caused by the abnormal foot structure, prevent foot injury, prevent further damage to the knee, hip and spine, etc. Biomechanical corrective insoles (functional corrective insoles) are most commonly used as prefabricated semi-finished products, which function for normal physiological needs, and can be modified and re-formed on the basis of this semi-finished product to suit each patient due to different conditions. Most of the foot disease supports are very effective and even have immediate effect on the treatment.