In China, gastrointestinal tumors have been a serious threat to people’s health. With the improvement of people’s living standard, the incidence of esophageal cancer and gastric cancer has decreased, but colorectal cancer has increased compared with the past. Colorectal cancer (CRC) is one of the most common malignant tumors in human beings, with the fourth highest incidence of malignant tumors in the world, involving about 1 million people per year and nearly 500,000 deaths per year. In Europe and the United States, colorectal cancer is the second leading cause of death from malignant tumors. In recent years, due to the westernization of life style, the incidence and mortality rate of colorectal cancer in China has been increasing year by year, and the age of onset is also significantly advanced. According to the data, in 2010, more than 37,000 new cases of malignant tumors were reported in Beijing’s registered population, which is equivalent to an average of 104 people diagnosed every day. 10 years later, the cancer incidence rate of Beijingers has increased by 4 percentage points on average. Since 2007, cancer has overtaken cardiovascular diseases to become the first cause of death in Beijing. According to the monitoring data of Beijing Cancer Prevention and Treatment Research Office, more than 37,000 new cases of malignant tumors were reported in 2010, with an average of 104 people being diagnosed with new cases every day. The incidence of malignant tumors among Beijingers increases with age. Among new cases in men, the incidence of lung cancer ranks first, followed by colorectal cancer, liver cancer, stomach cancer and esophageal cancer; among new cases in women, the incidence of breast cancer ranks first, followed by lung cancer, colorectal cancer, uterine body cancer and thyroid cancer. According to research, 40% of malignant tumors can be avoided through active and effective preventive measures, 40% of malignant tumors can be clinically cured through early detection and early treatment, and 20% of malignant tumors can survive for a long time through standardized treatment. The digestive system is stimulated by different physical and chemical foods and is one of the organs most vulnerable to external environmental attacks. Many digestive tract tumors are closely related to a person’s lifestyle habits, such as alcohol consumption, smoking, and betel nut chewing are all prone to develop related tumors. The following are two common types of cancer knowledge: 1. Colorectal cancer: its incidence is positively correlated with meat and fat consumption. Blood in stool, change of stool habit and abdominal pain, bloating and anemia are the early symptoms of colorectal cancer. In terms of prevention, we should pay attention to reasonable dietary arrangement, eat more fresh vegetables, fruits and other foods rich in carbohydrates and crude fiber, and take appropriate amount of calcium, molybdenum and selenium to help prevent colorectal cancer. 2.Stomach cancer: it is related to smoking, drinking alcohol, drinking strong tea, eating pickled food and pasta. Early detection and early treatment are important to improve the cure rate and survival rate of gastric cancer. For the history of chronic gastritis and stomach pain, if the following symptoms change, it is an early alarm signal of gastric cancer: (1) abdominal pain loses the regularity of the original ulcer attack; (2) stomach pain attack is not significantly relieved after eating or taking medicine; (3) loss of appetite, weakness and emaciation; (4) continuous blood in stool or even vomiting blood; (5) more than 5 years after Bi II gastric surgery, there are symptoms of indigestion, emaciation, anemia and gastric bleeding. Patients with previous chronic atrophic gastritis, gastric polyps, gastric ulcers, pernicious anemia and most of the post-gastrectomy patients should have regular checkups at the hospital, especially those with family history of gastric cancer. At present, surgery is still the main treatment method for gastrointestinal tumors and one of the main means of palliative treatment. A part of early stage patients can be cured by surgery. However, because the current situation in China is to emphasize treatment rather than prevention, most of the tumor patients are already in the middle and late stages when they are found, so the possibility of obtaining cure through surgery alone is greatly reduced, and other treatments must be combined to obtain a higher cure rate and longer survival. Chemotherapy is commonly known as chemotherapy, which is usually used for preoperative, intraoperative and postoperative treatment of malignant tumors as well as palliative treatment of malignant tumors. Chemotherapy, as an important part of comprehensive tumor treatment, has made great progress in the treatment of gastrointestinal tumors. In addition to the traditional 5-fluorouracil, many new chemotherapeutic drugs such as Siroda, Tegeo and Oxaliplatin have been developed. Chemotherapy methods mainly include single-agent chemotherapy and combination chemotherapy, but it is generally believed that the effect of combination chemotherapy is better than single-agent chemotherapy. Preoperative chemotherapy can improve the efficacy of surgical treatment. Intraoperative chemotherapy is one of the important measures to prevent medical dissemination. Postoperative adjuvant chemotherapy is the most commonly used comprehensive treatment method for GI cancer. Postoperative chemotherapy mostly adopts combination chemotherapy, and there are various types of combination chemotherapy regimens, but generally 5-Fu and DDP are used as basic drugs. Postoperative adjuvant chemotherapy can prevent postoperative recurrence of tumor patients. Chemotherapy has an important palliative role for postoperative recurrence patients. Prospective studies have shown that abdominal chemotherapy can reduce intra-abdominal recurrence and liver metastasis. Radiotherapy plays an indispensable role in the treatment of rectal cancer, and has an important role in preoperative downstaging of rectal cancer, improving the rate of anal preservation, postoperative consolidation therapy and patients with inoperable rectal cancer obstruction. With the progress of science and technology, biological therapy has gradually got rid of the perception of being a giant in theory and a dwarf in clinical practice as people used to know, and become a truly effective treatment tool. This has been confirmed in the treatment of lymphoma and breast cancer. In the gastrointestinal tract tumors more research is colorectal cancer, the main treatment tools are: 1. Monoclonal antibodies: such as bevacizumab (Avastin); cetuximab (Cetuximab). Patients with her-2 overexpression in gastric cancer can also be treated with Herceptin. 2. Tumor vaccines: such as autologous tumor cell vaccine (ATV-NDV), autologous cell immunotherapy (CIK), dendritic cell vaccine, etc. Especially, monoclonal antibodies combined with chemotherapy and other means have achieved better efficacy. Among the molecularly targeted therapeutic agents, Gleevec has a notable performance in the treatment of gastrointestinal mesenchymal tumors. Various supportive therapies have a positive effect on prolonging the survival of tumor patients. Among them, various stents have an important role in relieving the obstruction of esophagus and gastrointestinal tract; parenteral nutrition is very important for advanced tumor patients; various antiemetic drugs and leukocyte-raising drugs have an inestimable role in completing radiotherapy and chemotherapy for tumor patients. Chinese herbal medicine has been used to treat malignant tumors in China for thousands of years. Cooperating with TCM treatment can reduce toxic side effects, strengthen anti-cancer effects, enhance immune function, prevent recurrence and metastasis, and improve survival quality and survival rate. TCM can also be used as a follow-up treatment after the completion of western medical treatment. Colorectal cancer patients should choose the quality and quantity of diet reasonably after the surgery. Post-operative recovery diet generally starts from drinking water, gradually over to liquid diet and semi-liquid diet. After recovery, it is appropriate to use high protein, high calorie, low fat and easily digestible food, and add or subtract additions according to stool properties, frequency and volume, etc. Spicy and stimulating food is prohibited, and it is better to have light diet and not to eat greasy food. Early after rectal surgery patients will experience disorders of intestinal function, most commonly diarrhea, followed by constipation, which generally relieves significantly after 3 to 6 months after surgery and requires no special treatment. For those who have a lot of diarrhea, consider antidiarrheal medication for symptomatic treatment.