Burns are injuries caused by the action of flames, steam, hot liquids, electric currents, chemical substances, etc. on the human body, which have been greatly reduced with the improvement of people’s safety awareness and product safety, but still inevitably occur from time to time in daily life and production labor. The depth of burns is generally estimated using the three degrees and four divisions, namely, first-degree burns, second-degree burns (shallow second-degree burns, deep second-degree burns) and third-degree burns. Severe burns not only damage the skin, but can also reach deep into the muscles, bones and even internal organs. There are red spots between; pain can be felt when plucking; third-degree burns: loss of skin sensation, inelasticity, dryness, no blisters, waxing white, scorching or carbonization; no pain when plucking. Judgment of burn area: the injured person’s own palm area is about 1% of the human body surface area, which can be roughly estimated as a standard, the burn area of more than 10% for adults and more than 5% for children should be hospitalized for observation to avoid shock and life-threatening. The principle of first aid for burns is to quickly get away from the source of fire or other sources of injury, protect the trauma, and refer to the doctor as soon as possible. The reasons for getting away from burns should be different methods according to different situations: 1, flame burns should quickly leave the source of fire, when the body on fire can be doused with water to extinguish the fire, can also take off the clothes on fire, or roll on the ground to press the fire out, do not run to avoid the fire by the wind to burn more and more vigorous and thus aggravate the burns; do not use your hands to put out the fire to avoid secondary hand burns; in the confined fire scene as far as possible with a wet cloth towel to cover the mouth and nose, less talk, especially not loud calls to prevent inhalation of high temperature. In particular, do not call loudly to prevent inhalation of high-temperature smoke to respiratory burns. 2, by steam or hot liquid burns, immediately remove the scalded parts of the clothing can avoid burns aggravated, while the available cold water shower or soak for half an hour. 3, burns should immediately cut off the power supply; 4, kind of chemical burns (except alkali burns) can be rinsed with water as soon as possible to help reduce the damage, the immediate treatment of burns: 1, for small burns and burns on the extremities, available cold water rinse or soak, can play a role in reducing damage to reduce pain, soaking time is generally half an hour or no pain so far. Burns on the chest and back of the casualty, the rescuer can cover the trauma with a clean towel, and then pour cool water upward to reduce pain. 2, the treatment of facial blisters: for the unbroken blisters should be in the protection to avoid breaking, to the hospital under aseptic conditions can take the method of suction to keep the blister skin intact, so that it is close to the trauma, to be removed after healing, this is conducive to the repair of regenerative trauma; for deep II degree burns blisters, regardless of infection or not, should remove the rotten skin to avoid infection. At the scene of first aid, the burned trauma should be simply wrapped with clean sheets or clothes, taking care not to break the blisters on the trauma, and not to apply any medicine for the treatment of burns on the trauma to avoid affecting the depth judgment; patients with large burns can only be given light saline but not a lot of fresh water, otherwise it will intensify edema and complications such as hyponatremia; injured patients injured by explosive combustion accidents, trauma contamination Serious, no need to forcibly remove clothing debris and dirt on the trauma, simple bandaging and immediately sent to the hospital for treatment. For cardiac and respiratory arrest, first give cardiopulmonary resuscitation treatment; combined with hemorrhage of the extremities should be on a tourniquet; with fractures to give a simple fixation; common strong alkali chemical burns are: potassium hydroxide, sodium hydroxide and lime burns. First aid, first remove the clothes soaked with lye, and then rinse the wound with plenty of water. The use of acidic neutralizing agents must be careful to avoid aggravating the burn by neutralizing heat. Generally, after a lot of water rinsing, no more neutralizing agent is used. The rinsing of the eye must be thorough, and the eye must be rinsed first, for at least 15 minutes, followed by the application of antibacterial ointment. For burns caused by quicklime, sweep off the lime powder stained on the skin first, and then rinse with plenty of water. Never soak the injured part with a large amount of lime powder directly in water to avoid aggravating the burn by the heat of lime in water. After cleaning the wound with a clean sheet or clothing simple bandage, that is, sent to the hospital for treatment. Common strong acid chemical burns are: sulfuric acid, nitric acid, hydrochloric acid. Nitric acid burns have yellow scabs; sulfuric acid burns have black or brown-black scabs; hydrochloric acid or carbolic acid burns have white or gray-yellow scabs. First aid quickly flush the trauma with plenty of water, then use baking soda to neutralize the acid on the trauma, and then wash thoroughly with plenty of water. Special attention should be paid to thorough cleaning of the eye, and the eye should be rinsed first, at least for 10 minutes, and the rest of the disposition is the same as for thermal burns.