Objective To explore the cause of chronic gastritis and its relationship with Hp infection, different courses of the change of mucous membrane shape under gastroscopy, and relation between bile back flow gastritis and Hp infection in children. 目的探讨小儿慢性胃炎的病因与幽门螺杆菌(HelicobaeterPylori,HP)感染的关系,不同病程的胃镜下黏膜形态改变,胆汁返流性胃炎(BilebacrflowgastritesBRG)与HP感染的关系。