The process of stool formation and excretion: When digestive juices enter the large intestine from the small intestine, stool is formed, passed and finally excreted in this tube. The large intestine consists of three main parts: the colon, the sigmoid colon and the rectum. Except for the rectum, which is fixed in the pelvic floor, the rest of the colon is free and fixed in the abdominal cavity. The entire length of the colon is about 1.2-1.5 meters, most of the water in the digestive juices is absorbed by the colon, and the concentrated solid portion becomes the stool, which is usually formed soft stool, and then eliminated through the rectum and out of the anus. In the digestive juices are transported, absorbed into the process of stool, usually normal people need about 6-12 hours. If this process is significantly prolonged there will be several phenomena, one is the interval between bowel movements will be significantly delayed, so constipated people will appear days or weeks before a bowel movement; at the same time the stool mass because of the longer time in the intestinal tract, the stool mass has become dry and knotty, in addition to dry and knotty outside of the poop in some people like an abacus or goat feces. This type of constipation that slows down the transmission process is clinically known as slow transmission constipation. This type of patients will often go to the pharmacy to buy their own medicine or pharmacy will also recommend the use of laxative leaves, rhubarb class of Chinese medicine, there are also unauthorized use of fruit guide tablets and laxative tea, etc., in fact, long-term use of these medicines patients have found that these medicines used more than not work. Why is this the case, is because these drugs are plant-based laxatives, intestinal stimulation, mainly to stimulate the peripheral nerves of the intestinal tract to promote intestinal peristalsis, and enhance the transmission capacity of the large intestine. With the passage of time, the intestinal function will be significantly reduced, constipation more aggravated.