Helicobacter pylori (Hp) infection is a major causative factor in chronic active gastritis, peptic ulcers, gastric mucosa-associated lymphoid tissue lymphoma and gastric cancer. h. pylori was designated as a class I carcinogen by the World Health Organization’s International Agency for Research on Cancer in 1994. Gastrointestinal experts point out that H. pylori is highly contagious and can be transmitted through the mouth, fecal mouth, stomach, etc. A, oral transmission Chinese people do not like to eat with public chopsticks, which provides favorable conditions for the invasion of H. pylori, the main route of transmission of H. pylori is transmitted through the oral cavity, as long as a member of the family is infected with H. pylori, it is likely to make the whole family is infected. The chances of being infected are also significantly higher in people who dine out frequently. In addition, H. pylori transmission can also be kissing, scientific research has found that: the stomach of H. pylori in the saliva will also have residual. And kissing is the most direct way to exchange saliva. Second, the fecal route: fecal contamination of water or food by H. pylori surviving in the feces, so that the drinkers or eaters infected with H. pylori, research shows that low temperature can extend the survival period of H. pylori, so low temperature preservation of food such as H. pylori contamination will increase the chances of transmission of H. pylori. Third, the gastrointestinal route: refers to the transmission of H. pylori to healthy people through the vomit of infected people. It mainly occurs in nursery schools, kindergartens or among the siblings of children. Children are prone to vomiting and physiological gastroesophageal reflux. Moreover, children have poor hygiene awareness and have a tendency to suck their fingers, and H. pylori is easily spread among children living in groups. Therefore, in daily life, H. pylori patients diet should develop good hygiene habits to prevent infection. Pay attention to regular diet to ensure nutritious, soft and easy to digest food, eat little and often, chew and swallow slowly, avoid overfilling, avoid cold, sour and spicy, fried and stimulating food, avoid smoked and pickled food. Pickled foods containing nitrosamines also have carcinogenic effects, which, together with the positive effect of H. pylori, will increase the chance of cancer.