The earliest and most important part of the treatment of burns is on-site first aid, which can greatly reduce the severity of burns if properly treated on-site. The basic requirement of on-site first aid is to terminate the heat source causing injury and emergency treatment, and take corresponding treatment measures for different causes of burns. Once the heat caused injury, need to do the following in time: 1, should be quickly detached from the heat source. If clothes on fire, immediately take off the burning clothes, or lie down on the ground and roll to extinguish the flames, or water, or use clothing and other things to extinguish the fire. Do not stand and shout or run to call for help, in order to prevent the increase of head and face and respiratory burns. If it is hot liquid burns, immediately remove the hot liquid soaked clothing, if not easy to remove, can immediately cut off the clothing. 2, timely and large amounts of cold water rinse. Cold therapy is to put the injured limb under flowing tap water to rinse or put it in a large basin to soak after the burn, if there is no tap water, the limb can be immersed in well water, river water. Cold therapy can lower the local temperature, reduce the pain of the wound, stop the continued damage of heat and reduce oozing and edema. The duration of cold therapy is mostly based on the fact that there is no more severe pain in the wound after stopping cold therapy, which is about 0.5 to 1 hour. The water temperature is generally 15-20 ℃, if possible, can put some ice in the water to reduce the water temperature. Timely cold therapy can neutralize the residual heat that invades the body, prevent the heat from continuing to penetrate, prevent the wound from continuing to deepen, reduce the depth of tissue burns. 3, after the injury wound should not be coated with colorful drugs such as methyl violet, red mercury, etc., and do not burn wounds coated with brown sugar, soy sauce, cooking vinegar, honey, etc., these methods not only affect the depth of trauma judgement, but also cause or aggravate trauma infection, should be used to cover dry clean sheets or clothing transferred to the hospital for treatment. If there are chemical burns, should immediately remove the contaminated clothing, immediately rinse a large amount of clean water for at least 20 minutes or more, do not wait to get a neutralizer and delayed rinsing time, especially to pay attention to the eyes of the rinse, so as not to cause the consequences of blindness. First aid for electric burns, should immediately cut off the power supply, so as to avoid the rescuer’s own electrocution. If you find the casualty respiratory arrest, should be immediately at the scene of extracorporeal cardiac massage and mouth-to-mouth artificial respiration, to be resuscitated, and then promptly transferred to the nearest specialized hospital for further processing. If due to the arc so that the clothing fire burns, first of all should cut off the power supply, and then according to the fire extinguishing methods of flame burns to extinguish the fire.