Laxatives should be selected according to the patient’s condition. At present, laxatives commonly used in clinical practice include laxatives, gastrointestinal dynamics drugs, digestive aids and so on, all of which can produce good results. 1. Laxatives (1) solvent laxatives, such as methylcellulose, psyllium preparations, etc., and the type of substance is easily absorbed, and can also adsorb water, increase the amount of feces, promote intestinal peristalsis, from the laxative purpose. (2) Osmotic laxatives, commonly used for polyethylene glycol, has been used as intestinal cleansing agent, for the treatment of constipation effect is also relatively good. (3) Salt preparations, commonly used for sodium sulfate, magnesium sulfate, hydroxide enzyme, etc., of which magnesium sulfate has a faster onset of action, but the use of too much can lead to a large number of watery stool discharge. 2. Gastrointestinal dynamics drugs, including mosapride, domperidone, etc., can promote gastrointestinal peristalsis, promote timely discharge of stool. 3. Digestive aids, including lactase, pepsin, etc., can help digestion, reduce indigestion, constipation and other chances, indirectly play a laxative effect. Each patient’s physical condition is different, the causative factors are also different, so the choice of specific drugs should be under the guidance of a professional physician.