Chinese residents’ dietary pagoda suggests that normal adults should consume 1500-1700ml of water a day, and about 2500ml is appropriate for the whole day, which contains water in the diet. Weight loss people without kidney metabolic function abnormalities, and increased exercise, sweating, drinking 3000ml of water a day to accelerate the metabolism of the body, belongs to the normal range. The water in the body of normal people will be discharged with the normal metabolism of the kidneys with urine, the right amount of water can promote the body’s metabolism, lubricate the gastrointestinal tract, and promote defecation. Weight loss people with exercise, water will be discharged through the form of sweat, can be appropriate to drink more daily, can drink 3000ml of water a day, will not produce excessive burden on the body. With the increase in exercise may be a certain degree of dehydration, it is not advisable to replenish too much water in a short period of time to avoid causing water-electrolyte disorders, a drop in blood pressure or increased circulation, frequent urination, dizziness, weakness and other symptoms, if too much water is retained in the body, easily lead to swelling and even water intoxication. In addition, some patients with cardiac and renal insufficiency are not recommended to drink too much water every day, and the daily water consumption should not exceed 2000ml, otherwise it may increase the metabolic burden of the heart and kidneys, and water cannot be discharged normally, and edema in the limbs, chest and abdomen, and even have an impact on cardiopulmonary function.