Abstract: The Jiulongshan mountain district is situated in 28˚12′N. and 118˚52′ E. at the southwest of Suichang county in Zhejiang Province. The total area is more than 75 square kilometers, and the highest peak of which is 1724 meters above sea level.The flora of Jiulongshan area abounds with plants species and list of primary study includes 143 families, 584 gemera and more than 1149 species. In general, its origin is rather ancient. Its main compounents are those of subtropical and tropical areas.According to the result of numerical taxonomic analysis using the software of NTS system on microcomputer, 6 main vegetational types: the evergreen broad leaved forest, the mixed evergreen and deciduous broad leaved forest, the deciduous forest, the hilltop brushwood, the coniferous forest and the bamboo forest could be recognized. Basically, the evergreem broad leaved forest is the zonal vegetation, but the current representative vegetation there is the mixed evergreen and deciduous broad leaved forest.