We have identified a biological active component,panaxadiol saponins component (PDS-C),fro m Chinese ginseng extract.PDS-C contains 5 ginsenoside monomers with total purity of 92.44 ％.In this study,the BALB/c mouse model with immune thrombocytopenia (ITP) was established by infusion of antiplatelet antibody every other day,the platelet counts of ITP mice steadily decrease d to 20 ％to 30 ％of the normal levels and then remained steady for about 10 days.