Hormone ingredient in the egg oil, egg and Oviductus Ranae of Rana temporaria chensinensl is David were studied as well as the effect of egg-oil on platelet aggregation and blood lipid.Results proved that the estradiol content in the egg-oil is very high.The egg-oil can obviously inhibit blood platelet aggregation and showed an hypolipemia activity. It is expeetedthat the egg-oil of R. temporaria chensinensis can be developed as an efficient medicine for the prevention and cure of atherosclerosis and hyperlipemia in elderly.