Cordycepts sinensis is a famous and precious medical fungus.It has been studied by many countries for medical value. Recently,the effective constituents in cordycepts sinensis and mycelium has studied better by researchers with different methods.At present it is investigated clearly in its effective constituents including cordyceps polysaccharide protein,amino acid,d-manitol,fat and fatty acid,codycepin,alkaloid,antibacterial substance,trace element,immunosuppressant agent.