Water is an important part of the diet and is necessary for all life activities, and its requirement is mainly affected by age, physical activity, environmental temperature and other factors. Adults with little activity should drink at least 1500~1700ml of water per day. The human body’s need for water is affected by metabolism, physical activity, diet, age, temperature, etc., so the need for water varies greatly among different groups of people. Lightly physically active adults living in mild climates should drink at least 1500 ml of water per day. Under conditions of high temperature or intense physical labor, the amount of water consumed should be increased appropriately. It is important to note that the daily water intake is not absolute, and each individual can increase or decrease the daily water intake appropriately according to his or her situation. Although water is an essential component of the human body, drinking water should not be blindly excessive. Drinking too little water will easily affect the normal physiological functions of the body, and drinking too much water will increase the body’s metabolic burden, so drinking water needs to be moderate. When the body appears uncomfortable, should promptly seek medical attention.