Preventive methods of colorectal cancer include regular medical checkups, maintaining healthy living habits and healthy diet. Colorectal cancer is a common malignant tumor of the intestinal tract, which can be caused by heredity, gene mutation, bad dietary habits and other factors. Early detection of cancerous lesions or precancerous lesions such as familial intestinal polyposis and villous adenoma can be achieved through regular medical checkups, so that early treatment can achieve a better prognosis. In addition, the incidence rate of colorectal cancer can be reduced by maintaining healthy living habits, such as not staying up late, regular work and rest, proper exercise, and maintaining a good mindset. Since one of the risk factors for colorectal cancer is poor dietary habits, one should pay attention to healthy diet, such as eating less barbecued, pickled and smoked food, and eating more fresh vegetables and fruits.