Three-year-old child constipation is not the fastest and most effective way of approach, need to choose different treatment measures according to the cause of constipation, functional constipation through the development of good diet and bowel habits, medication diarrhea and other ways of treatment, organic constipation is mainly needed to treat the primary disease. 1. Functional constipation: mainly due to bad dietary habits, intestinal malfunction, mental factors and other non-systemic diseases or intestinal diseases caused by constipation. (1) Develop good dietary and bowel habits: parents should increase children’s dietary fiber intake and drink more water to develop good dietary and bowel habits. Dietary fiber supplementation such as celery, coarse grains, etc. is the first choice of treatment for functional constipation. (2) drug diarrhea: can take laxative drugs such as lactulose oral solution, lactulose oral almost not be absorbed, increase the water volume in the colon, thus stimulating colonic peristalsis, relieve constipation, but also restore the physiological rhythm of the colon. Can also be discharged through the enema of corkscrew feces, corkscrew is a hypertonic laxative, not absorbed by the intestinal wall, can lubricate the intestinal wall, soften the stool, remove the rectum, the colon accumulation of feces, the effect of acute constipation, but can not be used for a long period of time. 2. Organic constipation: mainly due to congenital megacolon and other intestinal diseases resulting in constipation. Organic constipation is mainly treated through the treatment of primary diseases (mainly surgical treatment), but also can be temporarily used under the guidance of a doctor laxative. All of the above medications should be used under the guidance of a doctor, avoid self-medication to avoid adverse effects.