The incidence of colorectal cancer in Europe and the United States has been higher than in Asia, but in recent decades, the incidence of colorectal cancer in Asia has been growing year after year, and even the first-tier cities and Europe and the United States on a par, and in 2013, Guangzhou City, Guangzhou, the CDC issued the Guangzhou tumor disease spectrum, every 100,000 people in Guangzhou, there are 7 people who suffer from colorectal cancer data is still vivid in our minds. In addition to environmental factors, personal dietary habits, lifestyle “westernization” is to blame. “After the improvement of the standard of living, many people eat more and more good, more and more fine, in turn, let the colorectal problems.” Colorectal cancer is in a sense a disease of affluence, a study found that high-fat recipes and insufficient food fiber is the main cause of morbidity, high-fat diets, especially diets containing saturated fatty acids, which can promote the generation of cholesterol metabolites and secondary bile acids, with a carcinogenic effect, insufficient food fiber or to increase the opportunity for carcinogens and the mucous membranes of the large intestine to come into contact with.” Early detection, stage Ⅰ bowel cancer 5-year survival rate has reached 90% -95% Six categories of people are the high incidence of colorectal cancer patients, colorectal cancer high incidence area above 40 years of age with gastrointestinal symptoms, such as blood in the stool, mucus stools and abdominal pain; a history of colorectal cancer; colorectal cancer pre-cancerous lesions such as colorectal adenomas, ulcerative colitis, Crohn’s disease, schistosomiasis patients; colorectal cancer family history of the Immediate family members; Immediate family members with a family history of colorectal polyps; Those with a history of pelvic radiotherapy. In the early stage of colorectal cancer, the lesions are limited to the mucosa and may be asymptomatic or only have changes in bowel habit. However, in the middle and late stages, there will be the following symptoms: 1. Abdominal distension, abdominal pain. The causes are due to intestinal dysfunction or intestinal obstruction. It is mostly concentrated in the middle and lower abdomen, mostly hidden pain or distension, and tends to worsen gradually. 2, blood in the stool, because the lesion is closer to the anus, the blood color is mostly bright red or dark red, and often the blood is separated from the stool. Only when the bleeding is more, the stool is brownish red and jam-like. In patients with right half colon cancer, this kind of blood in stool visible to the naked eye accounts for 36.5%. This also belongs to the early symptoms of colorectal cancer. 3. Anemia, when long-term chronic blood loss exceeds the compensatory function of blood production of the body, patients can develop anemia, which is an early symptom of colorectal cancer. Tumor obstruction, when the tumor grows to a considerable volume or infiltrates the muscle layer of intestinal wall, it can cause narrowing of intestinal tube, small intestinal lumen and obstruction of intestinal content. 4. Change of stool habit and character. Patients with rectal cancer may have more frequent bowel movements, but each time there is not much or even no feces at all, only some mucus and blood are discharged, and there is a feeling of incomplete bowel movement. The change of stool habit and frequency, as well as constipation or unexplained diarrhea may occur only when the tumor of large intestine is relatively large and has erosion, ulcer or infection. If the cancer protrudes and grows towards the rectal lumen, resulting in relative narrowing of the intestinal lumen, the discharged stool tends to be thin and deformed, which may be flat, and sometimes some blood filaments are attached to the deformed stool. How to stay away from colorectal cancer in life, improving dietary habits is especially important. Reasonably arrange daily diet, eat more fresh fruits, vegetables and other foods rich in carbohydrates and crude fibers, and appropriately increase the proportion of coarse grains and miscellaneous grains in staple food, which should not be too fine and refined. Change the habit of eating meat and high protein food. Eat less high-fat food, especially to control the intake of animal fat.