Prostaglandin E1 ( PGE1) , derived from D-HLA and controlled by phospholipidase A2, is a kind of strong endogeneous vasodilator and platelet inhibitor. Its effects on vasculars and platelets are just inferior to prostacyclin only, which is the strongest physiological vasodilator and platelet inhibitor, and the common receptors exits.Now it is found that exogeneous PGE1 can central some kinds of paletet supra-activation in illnesses such as cardiovascular disease, renal disease and diabetes mellitus. So PGE1 may be benificial to those patients.