In the trend of global warming and the increasing number of participating in high-intensity sports, the incidence of heat stroke is increasing year by year. Heat stroke is categorized to the class of heat emergent diseases. If there is no quick and effective treatment, the mortality rate is as high as 50%. Early, rapid, and effective cooling is the key point in the treatment of heat stroke. The early recognition and rapid lowering the core body temperature to 38.9 ℃ within 30 minutes of exertional heat stroke results in better clinical outcome with the fewest complications, however, the "golden 30 minutes" is far from enough to complete emergency transport and evaluation. Therefore, it is urgent to develop a first aid suit for heat stroke suitable for field treatment and transportation, so as to achieve the treatment goal of early rapid and effective cooling in field environment. For this purpose, the medical staff of the department of critical care medicine of the Eighth Medical Center of the Chinese People's Liberation Army General Hospital designed and developed the split first aid suit, which is suitable for heat stroke patient in the harsh environment lacking medical supplies and water during transportation. The medical staff who designed the first aid suit obtained a National Utility Model Patent of China (ZL 2020 2 1627326.4). The split heat stroke first aid suit is composed of four main parts: a sleeveless coat, a hat, sleeves and wrapped pants. All of them are made by temperature changeable fabric which is a composite material made by fine porous silica gel particles and potassium nitrate. The cuffs of the sleeveless top of the clothes part and the sleeves are connected as a whole by the connecting pieces; and the front end of the hem of the clothes part and the wrapped trousers are also connected as a whole by the connecting pieces, which is convenient for fixing and transportation. In order to control the water injection quantity, the water injection bag and the corresponding components are designed to ensure the same amount of water can be injected to the heat stroke first aid suit at each time, so the same frigorific effect can be attainable. The service temperature is 14-18 ℃, so it will not cause local frostbite to patients when used for a long time. This split-type first aid suit can be used in the movement, rescue and transportation of heat stroke patients. It is easy to carry and use with accurate cooling effect with low cost, moreover, it is reusable and can be widely used for on-site emergency and transportation of heat stroke patients.