1.7 days-9 months：Infants with congenital clubfoot and polyarticular contracture. 2.9 months-2 years old: children with congenital clubfoot and polyarticular contracture, who have received irregular massage or plaster support orthopedic brace but still have foot deformity, can also use this orthopedic brace. Some children with deformities can be completely corrected and cured, while some children with heavy deformities can have their deformities partially corrected through the brace, so that the scope of surgery can be reduced, simplified, and the treatment effect and wound healing rate can be improved. 3, secondary clubfoot: such as congenital spinal nerve bulge, neurogenic clubfoot after laminectomy, can also be used under the guidance of a specialist after strict training of parents, because of poor pain sensation in the limbs of children, therefore, the use of braces to prevent skin pressure injury. Good use of braces can avoid surgery or reduce the scope of surgery.