The absorption function of the colon is the absorption of water and electrolytes, and can adjust the electrolyte concentration. Some of the fat hydrolysis products can also be colon, especially the absorption cell of the ascending colon, the formation of chylomicrons in cells, release to the lamina propria. Each part of colon absorption ability is of different sizes, right ( L) the maximum absorption capacity of colon, transverse colon, descending colon. Pathological factors such as colitis, will reduce the absorption of water and sodium ion of colon.