Abstract: By the study about the territorial differentiation of Yunnan vegetation,the vegetation throughout Yunnan Province may be divided into 5 zones:1.The zone characterized by seasonal rain forest, semievergreen monsoon forest of the monsoonal tropic in north-border (Ⅰ Ai); 2.The zone characterized by monsoonal evergreen broad-leaf forest of the south-subtropical plateau (Ⅱ Ai); 3.The zone characterized by semi-humid evergreen broad-leaf forest of the north-subtropical plateau (Ⅱ Aii); 4.The zone charactefized by evergreen broad-leaf forest of the east plateau (middle subtropic) ( Ⅱ　Bi);5.The zone characterized by cold-temperate needle forest and meadow of the south-east Qinghai-xizang plateau ,Ⅲ Ai).

Key words: principles, vegeatation, regionalism, Yunnan