Effects of some factors, including extraction time, extraction temperature and volume fractions of phosphoric acid, on the mass concentration of oligomeric proanthocyanidins( OPCs) were studied. The physical and chemical properties of the product were analysed. Thus,with ethyl acetate solution [phi (water) =8% and phi(phosphoric acid) =3%] as extractant,stirring at room temperature for 10 h,the yield was over 2. 2% and mass fractions of OPCs were higher than 70%. The product was grayish and had good water solubility. Its degree of polymerization was 3. 8 0. 2.