Abstract: Cinkgo seeds were beated with carious dose of Co-60 Garmma radiaton. When treated with 5krad Garmma radiation, they could not sprout because of dead embryos, but the endosperm was still vigor ousin a relatove long period when treated under 80 krad Garmma radiation. Garmma radoation over 200 krad made Ginkgo seeds dewater more quickly and haver higher electric conductivity, lead the endosperm to soften and die, the respiration of ginkgo seeds was restrained gnatly after garmma radiation. When GinkgO seeds were treated by 5～20 krad and preservation period was 2 to 3 months (water content 40. 25% ) and 4 to 6 months (water content 35. 96% ) respeectively.

Key words: Ginkgo biloba Seed Radiation Preaervation