The purpose of the study was to determine the difference of aging time on germination and root tip cell ultrastructure of wheat cultivar,‘Xinchun 6’.Germination rate,seedling root length,seedling fresh weight,seedling dry weight,and the change in root tip skin form,cellular structure were included in this test.It was,then,easy to guess that germination rate,germination potential,germination index,seedling root length,fresh weight and dry weight were decreased sharply while MGT increase as the extension of aging time.And aging 4 d was the turning point of seed vigor drops by scanning seedling root of germination 72 h,we can find that along with the aging time,the root epidermal cells shrivel deepened/compacted,eventually.It can be caused shin burst,inside cells bared.Under the transmission electron microscopy,the degree of organelles dissolved obvious gradually,and the whole cell formation of cavity eventually.We can visibly saw that the seed gradually lost vitality may be caused by root epidermal morphology,internal changes in the cellular structure.