Generally under normal circumstances, after the enema about 10 ~ 30 minutes after defecation, but there is also a long time about 1 hour defecation, are normal. Enema is a certain amount of enema liquid from the anus through the rectum into the colon, can stimulate intestinal peristalsis, accelerate the discharge of feces, with cooling, defecation and exhaustion, supply of drugs, removal of harmful substances in the intestinal tract, but also as intestinal surgery, checkups and delivery of the preparatory work before. It is usually categorized into retention enema and non-retention enema. Non-retention enema is commonly used for patients with constipation and patients with bowel preparation, and it is retained for about 10 to 20 minutes after the enema, and most of the patients are able to have a rapid bowel movement about 30 minutes after the enema. The retention enema is mainly for the treatment of intestinal diseases, but also can play a sedative hypnotic role, usually choose to carry out before going to bed, because at this time the activity is reduced, the liquid is easy to retain. After the enema should be retained for more than 1 hour is appropriate, in order to make the medicine fully absorbed. Constipation patients should pay attention to the rational arrangement of diet, eat more fruits and vegetables, as well as appropriate exercise, such as clockwise abdominal massage, walking, gymnastics and so on.