Abstract: The paper discussed Arctic-Tertiary dispersal and its impact on flora of Himalayan-Hengduan Mountains since the Tertiary climatic vicissitude of Arctic regions. Through analyzing distribution patterns of Rhododendron, Acer, Salix, Betula,Alnus and some genera of Saxifragaceae, Triosteum showed there were quite a few groups of flora from Himalayan-Hengduant role on the flora development of the region.In addition, the two main pathways for the migration of the flora between the arctic regions and the Himalayandition, the two main pathways for the migration of the flora between the arctic regions and the Himalayan-Hengduan Mountains were suggested, one is Himalayan-Hengduan Mountain-Qinling-NE China.

Key words: Himalayas