Abstract:The Naning Mountain Range, with the location of 24°30‘ to 26°30‘N and 109°to 116° E and covering an area of c. 45000 km2, is situated in the region of boundaries among Fujian, Jiangxi, Guangdong, Hunan, Guangxi and Guizhou Provinces. It is an important dividing zone of natural geography in China and enjoys a relatively rich flora of vascular plants, including 248 families, 1184 genera, 3831 species, 14 subepecies, 348 varieties and 14 forms. The study indicates that the Naming Mountain Range has a typical subtropical flora and is characteristic of floristic transition from tropical to temperate composition. The flora, which possesses lots of relic, archaic, primitive and endemic elements of the Cathaysian flora, must be indigenous to the South China platform. The floras of tropical, subtropical and even temperate Asia might have a common origin as an integrity. The North America might have common floristic origin with the Cathaysia before its complete separation from Europe.