Recently, Beijing has entered summer with continuous high temperature. It is necessary to prevent heat stroke in summer. Heat stroke is a series of syndromes that occur when the body's thermoregulatory function fails in a high-temperature environment. Under normal circumstances, the body's heat production and dissipation are in a dynamic balance. When the surrounding temperature is lower than the body temperature, the body dissipates heat mainly by radiation. When the surrounding temperature is higher than or close to the body temperature, the body dissipates heat through the evaporation of sweat. However, evaporation is greatly affected by air humidity. The higher the humidity is, the less sweat people have. Therefore, under the conditions of high temperature and humidity, and low wind speed, the body's ability to regulate body temperature will be disturbed, which can easily lead to a series of uncomfortable reactions and heat stroke. Heat stroke can be divided into mild and severe heat stroke. Mild heatstroke is manifested as dizziness, headache, flushing, thirst, excessive sweating, fatigue, palpitations, rapid pulse, inattention, and uncoordinated movements. Severe heat stroke includes heat cramps, heat exhaustion, and heat shoots. The onset of heat exhaustion is rapid, and patients often have symptoms such as dizziness, vomiting, cramps, fainting, etc. Patients should drink cold and non-alcoholic beverages, take a cold bath or wipe the body with cold water, turn on the air conditioner and change to light clothes. If symptoms are severe, accompanied by heart disease or high blood pressure, you should seek medical attention immediately. Radiation sickness has various manifestations, such as nausea, extremely high body temperature (oral temperature above 39.5 degrees Celsius), red and hot skin with no sweat, and fear of cold. The patient should be moved to a cool place. It is advised to wipe the body with cold water or used other methods to quickly cool the patient. Patient should not drink much water. It is suggested to take a small amount of glucose saline and dial 120 quickly.