Abstract: Jishou county locates at the east of Yungui plateau with rich plants resources. There are 1 534 species under 662 genera belonging to 186 families of vascular plants in this area. The flora analysis at family level shows that:( 1)There are 29 families of pteridophyta: 9 cosmopolitan, 8 tropic, 11 trop. to subtrop. , and 1 of temperate zone respectively, and the trop. to subtrop. type has the most ratio ( 38% ) . There are 5 families of gymnosperm, 4 are representative types of subt rop. and the other cosmopolitan. Of the 152 families of angiosperm, 33 are cosmopolitan families, 8 tropic, 40 trop. to subtrop. , 38 trop. to temp. , 10 subtrop. to temp. , 16 temperate, and 7 endemic families of Asia. The total of trop. to subtrop. and trop. to temp. has the most ratio ( 51. 32%) . According to the analysis on the dominate and representative family of angiosperm, among the 38 dominate families, except 13 types of cosmopolitan, the total of the types of trop. to subtrop. ( 9) and trop. to temp. ( 11) also has the most ratio ( 52. 64% ) . Among the 14 representative families, the total of the types of trop. to subtrop. ( 4) and trop. to temp. ( 7) has the most ratio (78. 57%) . This paper indicates that Jishou county belongs to the transitional area between tropical and temperate with obvious characters of subtropical flora.

Key words: vascular plants, flora feature, family level