Inclusion Criteria:  1.Physician specialized in gastroenterology. 2.Diagnosis and treatment conditions for H. pylori exist in the hospital where the gastroenterology doctor is located.  (C13 urea breath test, C14 urea breath test, rapid urease test, stool H. pylori antigen test, histopathological test, H. pylori culture, any of the above)  Exclusion Criteria:  1.Those who are unable or unwilling to provide informed consent. 2.Patients with H. pylori have never been diagnosed and treated.