The dryness of the colon is mostly caused by the deficiency of intestinal fluid or heat, etc. It can be regulated by taking medicines such as Ma Zi Ren Pills, Wu Ren Pills and Ji Chuan Decoction under the guidance of doctor. 1. Ma Zi Ren Pill: the main treatment of intestinal dryness and heat, spleen constipation. Symptoms of dry stools, frequent urination, slightly yellow moss and less fluid. Old and weak, fluid loss and blood, should not be taken regularly, pregnant women should not be used. 2. Wu Ren Wan: the main treatment for the dryness of the intestines withered. Symptoms of difficult stools, as well as old age and postpartum constipation of blood deficiency, dry tongue with little fluids, thin and astringent pulse. Pregnant women should be cautious. 3. Jichuan Decoction: Treating weak kidney yang and insufficient essence and fluid. Symptoms include constipation, long and clear urination, soreness and weakness of waist and knees, dizziness, pale tongue and white fur. It is contraindicated in cases of heat injury and yin deficiency. It should be noted that, if there are symptoms of dryness of the large intestine, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor’s identification of medication to regulate.