The present invention relates to plant extracts, specifically, the extracts ofChinese medicineChenopodium ambrosioides L. and the composition comprising thereof. Theextracts of Chinesemedicine Chenopodium ambrosioides L. are prepared by conventional methods forthe extractionof volatile oil, and can be used to treat Helicobacter Pylori-induced diseasesof digestive system,such as gastritis, gastric ulcer, etc., with easy availability of rawmaterials, simple preparations,prominent effects, and less side-effect.