The incidence and mortality of malignant tumors in China are increasing year by year, among which malignant tumors of the digestive tract account for more than 50% of the incidence of adult tumors, and the trend of rejuvenation is obvious. Gastric cancer, liver cancer, colorectal cancer, esophageal cancer, pancreatic cancer are among the top eight malignant tumors in men and women. Most of the tumors have no obvious symptoms in the early stage and are easily neglected and delayed. Therefore, active prevention, early diagnosis and reasonable treatment are crucial. One is to change the single structure of diet, consume more fine fiber and high protein food; eat less overnight, fried, too hot, too spicy, too salty, too hard, pickled food. Diversification of food and rationalization of nutritional structure are conducive to tumor prevention. Pay attention to dietary hygiene and prevent water and food pollution. Secondly, take oral diseases, esophagitis, esophageal leukoplakia, gastric ulcer, atrophic gastritis, gastric mucosal epithelial hyperplasia, gastrointestinal polyps, Helicobacter pylori infections, various kinds of hepatitis, colitis and other diseases seriously and treat them in time. Regular rechecking, early detection of pre-cancerous lesions, resection or treatment of pre-cancerous lesions, including polyps, gastrointestinal chronic inflammation and so on, is the key to prevention. The three early signs include: feeling bad and obstructed in eating; loss of appetite and indigestion; bloating and abdominal discomfort; change of stools, frequent diarrhea or constipation, black stools or blood; unexplained and obvious weight loss; feeling weak, tired and short of breath, especially in the elderly. When the early alarm appears, it suggests that you need to go to the hospital for detailed examination. Fourthly, once the tumor is found, individualized, rationalized and standardized treatment plan should be chosen under the guidance of doctors according to the situation.