In this paper, we have made researches in the effect and mechanism of the polysaccharide prepar-ation from the leaves of lpomoea batatas (L.) Lam on platelet Count. An ideal thrombocytopenic ani-mal model has been established by intraperitoneal injection of antiplatelet serum (APS). We have fou-nd that this polysaccharide preparation increases the number of platelets and the level of thrombopoie-tin (TPO) evidently The results suggest that one important mechanism of the effect of this polysacch-aride prepar...