Drink eight glasses of water a day in accordance with the morning, middle and evening to scientific distribution, more conducive to physical health. The first glass of water is recommended to drink in the morning after waking up on an empty stomach, can replenish water, and can laxative, cleanse the intestines, more suitable for some middle-aged and elderly people. The second glass of water is consumed at about 10:00 a.m., or between breakfast and lunch, which can moisten the throat and quench thirst, improve vitality and increase work efficiency. The third glass of water should be taken before lunch to cleanse the mouth and increase the feeling of fullness to avoid eating too much for lunch. The fourth glass of water can be about half an hour after lunch, which can promote intestinal digestion. The fifth and sixth glass of water at 3-4 p.m. can relieve the afternoon sluggishness and improve the spirit. Drink the seventh glass of water before dinner and the eighth glass of water in moderation before going to bed. It should be noted that each drink to avoid too much water, to 100-200 ml is appropriate, sweating more cases can be appropriate to drink more water.