Rectal cancer is also a tumor of the digestive tract and in most cases it has no specific symptoms. Hemorrhoids also have a higher incidence rate in the population, and the presence of fresh blood in stool or pain during defecation will be considered as hemorrhoids. Therefore, this situation will cause more people to be less alert to rectal cancer, especially in some remote areas with poor medical conditions, inability to do timely medical checkups and lack of specialists, which will result in insufficient knowledge and attention of patients to this disease, and will result in the possibility of delayed diagnosis and treatment. Hemorrhoids, dyspepsia, most patients can through their own subjective assumptions, that this is not a major disease, and will not seek timely medical attention. Professional general surgeons will do rectal fingerprinting for patients when they hear that they have a history of this disease, which is a low-carbon and environmentally friendly method of examination. Most early rectal cancers will be detected early through fingerprinting, and some of them can be done through colonoscopy for early diagnosis and treatment.