Abstract: There are 392 species of woody plants in Heilongjiang province, belonging to 90 genera and 42 families, among which Gymnospermae have 4 families, 8 genera and 34 species. Dicotyledoneae have 37 families, 81 genera and 357 species and Monocotyledoneae have 1 family, 1 genus and 1 species. Heilongjiang province is a region where three distributions meet, which are Daxinganling,Northeast China and Mongolia steppe plant areas, therefore the flora of woody plants is complex in geographical elements and is of obvious temperate distribution. Though families of temperate distribution are equal to those of tropic distribution, their included species are more in number and have obvious advantages. The temperate distribution genera make up 75.86 per cent, in which the northern temperate distribution elements have the highest proportion. The species in temperate distribution make up 80.43 per cent, in which the northeastern temperate distribution elements have the highest proportion and next is the SinoJapon distribution elements. The woody plants in the area is ageold in origin, which contain 9 rare and threatened species, 14 endemic species and some relic species such as korea pine, amur corktree. The flora of Heilongjiang province is of typical tertiary flora system.

Key words: Woody Plants, flora, geographic element, Heilongjiang province