Abstract: Investigation indicates that the main four types of biological fireresistant forest belt in Thousandisles Lake district are Schima superba fireresistant forest belt(typeⅠ), S.superbaCastanopsis sclerophylla fireresistant forest belt (typeⅡ), Osmanthus fragransMichelia wilsoni fireresistant forest belt (type Ⅲ) and O.fragrans fireresistant forest belt (type Ⅳ). Of the four types of fireresistant forest belt, typeⅡand type Ⅲ are higher in species diversity than typeⅠand typeⅣ. As to the extent of similarity with the native evergreen broadleave forest, typeⅡranking first and typeⅠtakes the second place. The transformation of forest of Thousandisles Lake broadleaf forest would improve the fireproofing effectiveness of fireresistant forest belt, thus it was suggested that the construction biological fireresistant forest belt in Thousandisles Lake reservoir district should focus on typeⅡ belt, which had high species diversity, high fire performance ability and high similarity with native evergreen broadleaved forest. Further, the conservation of the small arbor trees of evergreen broadleaved of undergrowth such as Camellia fraternal, Eurya muricata, Cleyera japonica, Vaccinium bracteatum should be emphasized, by which the fireresistant forest belt construction should be achieved in coordination of development.