Constipation in children is very common and a problem that bothers parents. Constipation can be manifested as a decrease in the number of bowel movements (≤2 times/week), dry stools, long and laborious bowel movements, pain, and a feeling of incomplete bowel movements. Long-term constipation affects children’s health and can lead to anal fissures, hemorrhoids, loss of appetite and indigestion. So constipation is not a small problem, in addition to medication, behavioral therapy, etc., dietary treatment is also very important. Stool is composed of food residue, water and bacteria, therefore, the amount and frequency of stool is closely related to diet. A proper diet can achieve the effect of treating constipation. First of all, drink plenty of water, emphasizing plain water, to keep enough water in the intestinal lumen to soften stools, thus achieving the purpose of treating dry stools. Change the dietary structure to increase dietary fiber, including fruits (ripe bananas, apples, pears, etc.), fresh vegetables (celery, leeks, spinach, cabbage, turnips, etc.), whole grains, potatoes, etc., and reduce the intake of high-protein, refined foods. Most constipation is functional, but the treatment is long-term and usually easy to repeat. Family education and health promotion should be emphasized, and most of them can be improved and cured through reasonable diet and lifestyle. A small portion of constipation requires medication, and a very small portion of organic constipation requires surgery and other treatments. Therefore, if the effect of dietary treatment is poor, it is necessary to consult a doctor in time.