Abstract: The Fenhe Source is located in the hinterland of the Guancen Mountains of northern L黮iang Mountain Range.This area belongs to the warm temperate zone and has the largest larch and spruce forest in North China.With great ecological function,the flora in the Fenhe Source is complex and diverse.In this study,875 species of seed plants belonging to 398 genera and 94 families were found in the Fenhe Source.The gymnosperms included 12 species in 7 genera and 3 families,and angiosperms included 863 species in 391 genera and 91 families.Among these species,four were National Key Protected Plants and 24 were Key Protected Plants of Shanxi Province.The percentage of areal types of seed plants in families,ge-nera,and species had no obvious relevance,and the endemic types were also unbalanced.In the areal types of family,Cosmopolitan,Pantropic,and Temperate types included 40 families,19 families,and 30 families,respectively.However,no Endemic to China type was found.For areal types of genera,the temperate elements included 264 genera,in which North Temperate was the dominant type.Furthermore,Endemic to China type included 4 genera.The areal types of genera reflected temperate characteristics of the flora.In areal types of species,Endemic to China type included 501 species,which constituted the majority of the flora.The Temperate Asia and East Asia types included 236 and 97 species,respectively.These two types were the main constituents of constructive and dominant species of forest and shrubbery in Fenhe Source.