Digestive system tumors are the focus of consultation in two ways: First, the incidence of digestive system tumors is higher than other systems. Secondly, patients suffering from digestive system tumors do not have the conditions to receive consultation in the field and turn to online consultation. In our epidemiological survey, it is generally believed that the incidence rate of lung cancer is the first and digestive system is only the second. In the author’s opinion, the first place of digestive system tumor is in line with China’s national condition, which is caused by the lower living standard and poorer life of people in China as a developing country. According to the latest survey, there are about 250,000 new cases of esophageal cancer in China every year, which accounts for half of the number of esophageal cancer cases in the world. Therefore, the prevention and treatment of digestive system tumors should be the primary choice of medical research. Firstly, the nationals generally have a rough diet, mainly cereals with more coarse fiber content and rough processing particles, and the side dishes are plant-based vegetables, which are easy to cause damage to the digestive tract due to long-term friction; overheating, too spicy such as spicy hotpot, hot pot, etc. cause esophageal burns and form chronic inflammation or even ulcers, which is a kind of precancerous lesion, and the nationals have the saying that nine out of ten people have gastric disease, which means that nine out of ten people have gastric disease; also, due to the low protein content in the food structure, ulcers cannot be prevented in time. The ulcer cannot be repaired in time due to the low protein content in food structure, and then become cancerous. Secondly, bad dietary habits cause cancer. In the inland areas, pickled foods are often used as a meal, long-term use of nitrite-containing foods, leftovers transform nitrates into nitrites, barbecued foods, fried protein foods, etc. are all junk foods. Third, environmental pollution, excessive chemical fertilizer and pesticide residues. Fourth, high nitrite content in drinking water in saline areas. The concept of tumor is: under the long-term effect of tumor-causing factors, the body’s tissues and organs have differentiation abnormalities, excessive proliferation and the formation of new organisms. Prevention methods: Firstly, change the single structure of diet, consume more fine fiber and high protein including beans and vegetable protein; Confucius said: food is not averse to fine, braising is not averse to fine; coarse food should also be finely crafted. Do not eat overnight, fried, too hot, too spicy, too salty, too hard, pickled, contaminated food. Second, seriously treat inflammation and ulcers of the digestive tract, take clarithromycin, omeprazole and other anti-inflammatory and acid-suppressing drugs in a timely manner; pay attention to dietary hygiene in remote areas, and strictly prevent water and food contamination. Timely taking agents to strengthen the spleen and stomach, including Sijunzi Tang and Xiang Sha Lijunzi Tang, to prevent diseases before they occur, and to prevent changes from both diseases, can greatly reduce the incidence of digestive system tumors and save the nation from fire and water.