Abstract:〔Abstract〕 Objective To probe into and analyze the clinical effect of leucine oral solution combined with rabeprazole in treatment of chronic atrophic gastritis. Methods 98 cases of patients with chronic atrophic gastritis and who treated in Beijing Gulou traditional Chinese medicine hospital from March 2018 to March 2019 were selected,and the patients were randomly divided into the control group and the observation group by the random number table method, with 49 cases in each group. The control group was treated with rabeprazole, and the observation group was treated with rabeprazole combined with leucine oral solution.Then,the treatment efficiency, changes of serum indexes, comparison of pathological tissue biopsy, clearance rate of Helicobacter pylori (HP) and drug safety were analyzed and compared between the two groups. Results The total effective rate in the observation group was significantly higher than that in the control group,and the difference was statistically significant (P < 0.05).After treatment, the gastrin level of the two groups was significantly higher than that before treatment, and the endothelin level was significantly lower than that before treatment,and the difference was statistically significant (P < 0.05);After treatment, the gastrin level in the observation group was higher than that in the control group, and the endothelin level was lower than that in the control group,and the difference was statistically significant (P < 0.05).After treatment, the positive rates of gastrointestinal mucosal atrophy, intestinal metaplasia and atypical hyperplasia of two groups decreased significantly, and the decline rate in the observation group was significantly better than that in the control group,and the difference was statistically significant (P < 0.05). The HP clearance rate in the observation group was significantly higher than that in the control group, and the positive situation of pathological tissue biopsy and the incidence of adverse reactions were lower than those in the control group,and the difference was statistically significant (P < 0.05). Conclusion The effects of leucine oral solution combined with rabeprazole in treatment of patients with chronic atrophic gastritis are significant,which can effectively improve the levels of gastrin and endothelin in patients' serum and delay the pathological changes of gastric mucosa,thus it is safe and effective.