Abstract: The pattern of vascular reconstruction of graft was studied by observing the time-de-pendent growth of vessel,vascular construction and the relationship between blood supply and graft survival.The benzidin-stein techique was employed to present vessel and result was analysed with electron computer imaging analysis.The vascular density increased gradually from 5 to 10 days after transplantation,and it appeared the densest from 15 to 30 days,with the mean diameter of vessles becoming the thickest too.Both the vascular density and mean diamater got lower beyond 30 days survival.The vessels grew from periphery to the center, but it's unevenly distributed.In most cases,vascular deusity was high in areas with more survived neural cells.The vessels within grafts were thicker in diameter,but less in density than those within homologous normal area of brain.Within the areas neithbouring to grafts or demaged sites of the control group,vessels regenerated evidently and vescular diameter in-creased.They grew in the direction toward graft or lesioned area.

Key words: rat, nerve, transplantation, blood vessel regeneration