Abstract: Based on the analysis of the possible floristic affinity of the flora of Baihuashan Mountains near Beijing, this paper discussed the possible origin of temperate deciduous broadleaved forest of east Asia.It was concluded that the temperate deciduous broad-leaved forests of the world have close affinity in origin and the deciduous broad-leaved forest of east Asia is the initial one of which most floristic elements show close affinity to the flora of subtropical mountains in SW China.

Key words: temperate deciduous broad-leaved forests, origin