Pediatric burn area nine points method is based on adult burn area nine points method, according to the characteristics of pediatric body surface area slightly adjusted and formed. Adult burn area nine points method is: head, face, neck 3% each, a total of 9%, including 1 nine; both hands 5%, double forearms 6%, double upper arms 7%, a total of 18%, including 2 nine; trunk anterior 13%, trunk posterior 13%, perineum 1%, a total of 27%, including 3 nine; double buttocks 5%, double thighs 21%, double calves 13%, double feet 7% (male), a total of 46%, including 5 nine. 9 plus 1. According to the distribution characteristics of pediatric body surface area, the head of a child is relatively large. The proportion of area occupied by the head decreases with progressive age, approaching that of an adult at age 12 years. The body surface area of the two buttocks and two lower limbs of the pediatric body surface area with the increase of age, the proportion of the body surface area gradually becomes larger, and at the age of 12 years is close to the adult. Therefore, the surface area of the pediatric head is corrected to 9 + (12 – age), and the surface area of the buttocks and lower extremities is 46 – (12 – age).