PURPOSE: A producing method of a food composition for improving immune function using green tea hydrolysate is provided to offer the anticancer effect of the green tea hydrolysate to users. CONSTITUTION: A producing method of a food composition for improving immune function using green tea hydrolysate comprises the following steps: hydrolyzing green tea using pectinase； removing residues from the green tea hydrolysate； and precipitating polysaccharide from the green tea hydrolysate using ethanol, and obtaining crude polysaccharide. The crude polysaccharide contains rhamnogalacturonan-I or rhamnogalacturonan-II as an active ingredient.본 녹차의 효소 가수분해물 및 녹차로부터 분리한 다당류를 유효성분으로 포함하는 면역기능 증강용 식품 조성물 및 그 제조 방법에 대한 것이다.
