Peristalsis of the large intestine is realized by the transmission of contraction waves and intrinsic plexus. The large intestine includes five parts: cecum, appendix, colon, rectum and anal canal. The forms of peristalsis of the large intestine include peristalsis and group peristalsis, and the principles are as follows. 1. Peristalsis: the large intestine in addition to the external anal sphincter, the rest of the smooth muscle, the peristalsis of the large intestine is realized by a stable forward contraction wave, the smooth muscle of the large intestine to maintain a weak state of continuous contraction, the contraction wave in front of the gas-filled, in a state of diastole, the contraction wave to maintain the contraction of the back of the intestine to make the intestinal tube closed and empty the intestinal contents. 2. Group peristalsis: It is a kind of peristaltic movement unique to the large intestine that proceeds very quickly and can advance a long way, causing duodenal-colonic reflexes through the intrinsic plexus in the wall of the digestive tract, which usually occurs after eating, starting from the transverse colon, and sending part of the intestinal contents to the descending colon or the sigmoid colon.