To examine the relationship between the casual infection of gastric cancer and lifestyle and nutritional status we surveyed 169 persons 90 females and 79 males aged 40∼69 years from June 7 to June 14 1997 in Whachon area Kang-Won Do Korea. For this purpose we investigated Helicobacter pylori infec-tion and identified the effect of sex age, smoking alcohol consumption economic status occupation life-style and food intake on Helicobacter phlori infection. Helicobacter pylori status was evaluated using an en-zyme-linked immunosorbant assay(ELISA) for anti-Helicobacter pylori immunoglobulin G(IgG). Helicob-acter pylori infection was present in 66.3% of total subjects namely 67.7% of female and 64.4% of male and its prevalence increased with smoking low education level and low monthly income. Energy total protein calcium and vitamin C intakes in the negative Helicobacgter phlori infection group were higher than those in positive Helicobacter pylori infection group. However iron and niacin intakes were lower in the helicobacter pylori negative group than in the positive group.