Descending colon tubular villous adenoma belongs to colorectal tubular villous adenoma, which is a kind of precancerous lesion, and its development is related to heredity, diet, living habits, metabolism and so on. Colorectal tubular choriocapillaris adenoma that occurs in the descending colon is a proliferative true tumor of colorectal mucosal epithelial cells, and tubular adenoma and choriocapillaris adenoma are known as adenomas, which belong to one kind of precancerous lesions, in which choriocapillaris adenoma is more susceptible to malignant changes, and the malignant rate of colorectal tubular choriocapillaris adenoma is about 20%. The occurrence of this disease is closely related to genetic factors, i.e., the incidence rate of people with a family history of adenomas is significantly higher; there are also dietary factors, including insufficient intake of dietary fiber, high-fat and high-protein diets; lifestyle habits, i.e., lack of exercise, sedentary lifestyle, long-term smoking and drinking; and metabolic factors such as diabetes mellitus, hyperlipidemia, obesity, and metabolic syndrome. It is recommended that once diagnosed with descending colon tubular choriocapillaris adenoma, patients need to be under the guidance of a professional doctor, and actively comply with the doctor’s instructions for treatment, so as to avoid delaying the condition and affecting the health of the body.