(A) the cause of injury: burns cause a lot of injuries, according to the army burn orthopedic professional group 48978 hospitalized burn patients statistics, the most common thermal burns, accounting for 90%, such as boiling water, flame, hot metal, boiling liquid, steam, etc.; followed by chemical burns, such as strong acid, strong alkaline, phosphorus, magnesium, etc., accounting for 7%; again for electrical burns, accounting for 4%; other radiological burns, flash burns, etc.. Among them, life burns and flame burns accounted for 84%, but with the development of industrial and agricultural production, non-life burns increased. It should be noted that usually about 90% of the burns (burns) can be avoided. (II) injury judgment: the severity of burns judgment, mainly based on the area of burns, depth, location, age, the presence of combined injuries, pre-injury physical strength, the presence of visceral organic disorders and other factors to determine. 1.Area estimation: Calculated by the percentage of the burned area to the whole body surface area. The calculation of the surface area of the human body in China is commonly used in the Chinese nine-point method and the palm method, which is simple and practical and easy to remember, and the two are often applied in combination. 2, the identification of the depth of burns: China generally uses three degrees of quadratic method, that is, according to the depth of skin burns into shallow Ⅰ degree, shallow Ⅱ degree, deep Ⅱ degree, Ⅲ degree. Those deep to the muscle and bone are still calculated according to Ⅲ degree. Clinically, for the convenience of expression, the Ⅰ degree and shallow Ⅱ degree are called shallow burns, and the deep Ⅱ degree and Ⅲ degree are called deep burns. 3, burn site: face, hands and feet are the exposed part of the body, the most common burn site. The so-called special parts of the burns are the face, hands, feet, perineal burns, respiratory burns and eye burns, because these parts are important and directly affect the recovery of life or function, in wartime usual burn rescue must be paid attention to. The severity of burns depends on the burn area, depth and special parts of the burn situation. The larger and deeper the area, the deeper the special part of the burn is heavy; also with the age of the casualty, physical strength, the presence of full and injuries, the presence of chronic diseases and whether shock has occurred when rescued; in the battlefield rescue also pay attention to the presence of compound injuries or poisoning. Therefore, it is necessary to make a comprehensive judgment from all aspects.