Abstract:There are about 1776 species of the seed plants in the flora region of NE. China, be-longing to 116 families and 575 genera. The flora is temperate in nature. It has the wide connec-tion in geographical relationships, and it is closely related with rest E. Asia (especially with Japan). It is obvious in horizontal and vertical vicariance. The flora is composed of temperate elements, frigid and subfrigid elements, and tropical elemends.The principal part is the temper-ate elements which include many E. Asia by north elements. North Temperate elements and other temperate elements. The flora origin is not after the Tertiary Period.