Heel shoes are a kind of rehabilitation products in orthopedic shoes. As the name implies, the height of the heel is negative, that is, the front of the sole is high and then low, which is used to force the body's center of gravity to move backward and correct posture. It is the scientific research achievement of human mechanics and has published many related academic papers. Related disciplines involved: foot surgery, non-surgical orthopedics, gait analysis, rehabilitation medicine, (dance) body training, sports biomechanics, footprinting. It is one of the hot research directions of human mechanics, orthopedics and gait analysis. There are many papers and patents, and the products are quite common abroad. The safety angle of negative heel shoes is 2 to 7 degrees, and at the same time, there should be an inward inclination angle, that is, the sole is slightly inclined from the outside to the inside, and the heel thickness should not exceed 15 mm to prevent accidental injury. Heel shoes do not support slippers.