Dillenia indica Linn belonging to family Dilleniaceae has been has been widely used in people's daily life in Cao Bang province and Northern mountainous provinces of Vietnam as food; leaves and bark are used to treat kidney stones, fever, edema, bloating, cough, malaria, colds, flu, laxative, diarrhea, anti-inflammatory, etc.. Results of quantitative analysis of some components of ethanol extract (DIM) from Dillenia indica leaves, including: moisture content (6.2%), total ash content (8.1 reducing free sugars content (10.2%), cellulose content (12.1%), sterols content (23.6%), flavonoids content (6.8%) and terpenoids content (13.9%).