The control of cancer focuses on early diagnosis and treatment, and it is also the social responsibility of medical workers to enhance people’s perception and awareness of the disease. In the early stage of colorectal cancer, there are no symptoms or symptoms are not obvious, only discomfort, indigestion and occult blood in stool. With the development of cancer, symptoms will gradually appear, such as change of stool habit, abdominal pain, blood in stool, abdominal mass, intestinal obstruction, etc., with or without systemic symptoms such as anemia, fever and emaciation, but by this time, the tumor has already progressed to the middle stage. The tumor may cause changes in the affected organs due to metastasis and infiltration, showing clinical symptoms and signs of other organs. Therefore, colonoscopy is recommended for people above 45 years old who have digestive symptoms, and those without digestive symptoms also need to have fecal occult blood in the physical examination, and those who are positive must have colonoscopy. Because today’s medical checkup packages are blind to the detailed examination of the digestive tract, the so-called whole body checkup is not comprehensive enough. Direct removal of polyps can completely avoid the possibility of developing into tumors.