Children who have weak resistance may easily catch colds. Generally, immunity is strengthened through lifestyle adjustment, proper exercise, reasonable diet and medication. 1. Lifestyle adjustment: Develop good living habits, rationalize work and rest time, pay attention to the combination of work and rest, and avoid frequent late nights and overwork. At the same time, parents should pay attention to seasonal changes, especially in the seasonal changes, timely increase or decrease clothing for children. 2. Appropriate exercise: appropriate physical exercise, such as jogging, walking, swimming, tai chi, etc., to develop a good exercise habit, to a certain extent, can also improve immunity, enhance physical fitness, reduce disease. 3. Reasonable diet: you can eat more food rich in high quality protein, multi-vitamins, minerals and other nutrients, such as spinach, apples, eggs, lean pork, etc., but also need to ensure that the supply of sufficient energy. 4. Drugs: children generally do not use medication to enhance immunity, but if necessary, can be used under the guidance of a doctor to enhance resistance to drugs such as thymidine. Children are prone to colds, there may be many other ways to enhance immunity, if necessary, parents can take their children to consult a doctor for scientific guidance.