Abstract: In Pangquangou Nature Reserve,it was known that there were 809 species of seed plants in the region,which belonged to 359 genera and 89 families.Among them there were about 2 families 6 genera 7 species in Gymnospermae,and 87 families 353 genera 802 species in Angiospermae.15 families were more than 5 genera and 330 genera were not more than 5 species.These families and genera played(important)roles in seed plants flora.Analysis based on families,genera and species shown that the floristic elements in the region were diversity.Families: Cosmopolitan type was dominant in the families.It had 40 families.North Temperate type(24 families)was on the second place.Genera: Temperate floristic(elements)were significant in genera flora.256 genera belonged to temperate type,which accounted for(82.05%)in total genera.Moreover,Species endemic to China were the largest type of species elements.North of China elements were especially predominant.Some species such as Larix principis-rupprecht,(Rosa)xanthina and Pinus tabulaeformis were constructive or dominant species of the region vegetation.It was different in endemic of families,genera and species.There was no family,but 7 genera and 325 species were endemic to China.