As the ancients say, “To achieve longevity, the intestines are always clear.” Many documents interpret “clear” as the meaning of clearing, clean, health practitioners will be “clean intestine” as a principle of health, but do not know that the normal people excessive clean intestine will destroy the normal state of the intestinal flora. In fact, the ancient Chinese word multiple meanings, “Qing” should also contain the meaning of “positive, smooth”, that is, the normal rhythm of defecation, the normal state of the flora, in line with the four seasons of the diet structure. In layman’s terms, it is to ensure intestinal health. The intestine is the second brain of the human body, but also the body’s largest micro-ecosystem, where important beneficial bacteria such as bifidobacteria, not only can stimulate intestinal peristalsis, increase bowel movements, but also can enhance the body’s defense, enhance the body’s immunity. However, with the increase of age, the beneficial flora will be depleted, the balance of intestinal ecology will be broken, and various diseases will follow. Shanghai as a prosperous metropolis, work pressure, emotional tension, unreasonable dietary habits often lead to the intestinal tract in a “subhealthy state”, according to the survey report, 95% of people have intestinal problems, ranking second in Shanghai tumor colorectal cancer more seriously devour people’s health. A normal bowel rhythm should be 1-2 bowel movements in 1-2 days, and the feces should be soft and shaped banana stool. If you have irregular bowel movements, the production process of beneficial intestinal bacteria will be disturbed, which will eventually affect your intestinal health. To maintain a healthy intestinal tract, in addition to insisting on moderate exercise to promote bowel movement; maintaining a happy mood; using medication reasonably to avoid the abuse of antibacterial agents; and ensuring a balanced and reasonable dietary structure, what should be emphasized is colonoscopy. With the continuous development of modern technology, high-definition colonoscopy, ultrasound colonoscopy and other equipment was born, the detection and treatment of microscopic lesions, improve the survival rate and quality of life, epidemiological surveys show that: colon polyps, familial adenomatosis, ulcerative colitis and other pre-cancerous lesions, pay attention to the regular follow-up of colonoscopy, will effectively eliminate the occurrence of colon cancer. Once colon polyps are detected, they need to be treated. Colon polypectomy is an effective method to stop colon cancer, and the most direct, simple and cost effective test is the fecal occult blood test (coarse screening), while the most effective, visual and valuable test is colonoscopy. In fact, in addition to high-risk groups, patients with constipation, diarrhea, disease duration more than 3 months, history of previous gallbladder surgery and hemorrhoid bleeding should also be included in early screening.