Background: Helicobacter pylori (H. pylori) infection is common in developing countries. H. pylori infection epidemiology is variable, because the prevalence is high and occurrence of infection in happen in young ages in developing or poor countries compared to that which consider as developed countries. Study aim: was to determine the prevalence of Helicobacter pylori among children and to evaluate some epidemiologic characteristics. Methods: prospective cross sectional study was conducted at AL Hijjaj Primary Health Care Center during seven months period from 1 st of April to 31 of October 2018. Totle cases 120 (68 male, 52 female) presented with diarrhoea, their age range from birh to 6 years old. Stool samples were collected from each patient and send for Helicobacter pylori stool Antigen (HpSAg).some relevant factors like sex, source of water, type of feeding, educational level of the mothers and fathers are studied. Results: among 120 total cases,40.8% are positive for H.pylori stool Ag(HpSA), there is weak association between gender and HpSA presence, Very strong association between source of water and HpSA presence, Moderate significant association between type of food and HpSA presence, no significant association between fathers and mothers education and HpSA presence. Conclusion: H.pylori infection present in about 40.8 % of patients presented with diarrhea. Source of water is significantly related to the presence H.pylori infection