First, the first drinking water is the physiology of the hatched chicks. After hatching, some of the yolk sac of the chicks still have not been absorbed. The nutrients in this yolk are essential nutrients for the hatching of the chicks. The speed of absorption of the yolk mainly depends on sufficient drinking water. Therefore, it is a physiological practical need to give freshly hatched chicks first drinking water, which can effectively accelerate the absorption and utilization of yolk nutrients. The earlier the drinking water is, the better the use effect is. Giving chicks water first is more conducive to cleaning up the gastrointestinal tract, excreting meconium, promoting the metabolism of chicks, accelerating the conversion and absorption of yolk in the abdomen, and is more conducive to the growth and development of chicks. Otherwise, there is no absorption of yolk in the chicken's belly, and it is rushed to feed. This increases the digestive burden on the gastrointestinal tract and is not good for the chicks. Second, the young chick's digestive function young chicks have a short digestive tract, weak digestion, poor function, animal nutrition (yolk) is not easy to digest, low utilization, residual yolk in the abdomen, digestion and absorption needs to improve 3 ~ 5 days, so hatching young chicks should not be fed too early, even if they do not feed too much. Because chickens are greedy and do not know enough to eat, the solution is to regularly quantify and quantify, so as not to lead to digestive disorders. Third, the brooding environment makes the chicks need more water. The cell structure in the chicken body is composed of 74% moisture. The water has the function of regulating body temperature, transporting nutrients, excreting waste, and promoting the digestion and absorption of food. Therefore, it is an essential material for chickens. Only adequate drinking water can meet the chicken's growth and development needs and maintain the metabolic balance of water in the chicken's body. The drinking water needed by the chicken should be close to body temperature, not to drink cold water, so as to avoid cold water, fever, sudden drop in body temperature and incidence, but can not cut off water, prevent chicken development blocked or dehydration and die, the quality of drinking water should be controlled.