Abstract: ShanxiWanjiazhai Yellow River Diversion Project (YRDP)is a large diversion project from Wanjiazhai, Pianguan to Huyan, Taiyuan, and its length is about 285.03 km totally.It plays an important role in solving the problem of the absence of water resource in Taiyuan and Datong.There are 1 040 species of seed plants alongside YRDP that is a transect 285.03& #215;1 km2, belonging to 422 genera and 100 families, among which gymnosperms have 3 families, 5 genera and 9 species, and angiosperms have 97 families, 417 genera and 1 031 species.The angiosperms are composed of dicotyledon and monocotyledon, having 79 families, 321 genera and 793 species, and 18 families, 96 genera and 238 species, respectively.The flora of genera has some typical characteristics of warm-temperate flora.Among them, temperate distribution elements, having 246 genera and accounting for 58.29% in total genera, hold a significant dominant position.Moreover, among the floristic elements of species, endemic to China has 311 species, accounting for 29.90% in the total, and makes evidently dominant, and they are the major elements of the edificatos and dominant species of dominant vegetation types, such as Picea vilsonii, Larix principis-rupprechtii, Pinus tabulaeformis, Populus simonii, Populus cathayana, Salix babylonica and Ulmus glaucesens.

Key words: Wanjiazhai Yellow River Division Project, seed plant, flora, Shanxi