Abstract: HP test was done on 325 gastric mucosal biopies taken from POpulation of Tu ac Cha, oneof the regions with high incidence of gastric carcinoma in North Shaanai, in August, 1990. Theresults show that the HP positive rate was high (66. 77%), and was highest in the cases aged 5059. The part of gastric infected most commen was antral (65. 54%). The mpitive rate increasedas gastritis proceeded: it was 64. 35% in chronic superficial gastritis, 79. 31% in chronic atrophicgastritis,82. 05 % in chronic gastritis complicated by intestinal metaplasfa, 86' 67 K in chronic gastritis with displasia, and 94. 79% in chronic aCtive gastritis. All the characters above were accordant with that of incidence of gastric cardsoma in the recon. The authors suggest that the HP infection, in regions with high incidence of gastric carcinoma, be regarded as one'of the Pathogeulcfactors correlated to gastric carcinoma, and also be one Of the important pathogenic factors to theincidence and progress of chronic gastritis'.