In series of the the development of domestic natural products, the studies were conducted to evaluate the pharmacologically active substances of the roots of Pursatilla koreana, which is a specific plant, widely distributed in this country and known to be effective as antiinflammatory, hemostatic and antidysentric agents in oriental remedies. From the hydrolysis of methanol extract of the root, a triterpenic substance was isolated. It was identified as $hederagenin;C_{30}H_{48}O_4,; m.p.;333^{circ}{sim}334^{circ}$, by the m.m.p. with authentic sample, elemental analysis, IR, mass spectra and the other physico-chemical experimentations.