Abstract: 【Aims】 On the basis of field investigations in the past and published literatures, to analyze the distribution characteristics of fleas in Yunnan and the influence of geographical subregions on the flea fauna. 【Methods】 On the basis of field collection and additional literatures, flea species were identified and inventoried. The principal component analysis and cluster analysis were made by using software SPSS 13.0. 【Results】 In total, 144 flea species, which belong to 45 genera and 9 families, were recorded in Yunnan of China. Of the 144 flea species, 15 species are Palaearctic species, 108 species Oriental species, 15 species in both Palaearctic realm and Oriental realm, and 6 species cosmopolitan ones；75 flea species are endemic in Yunnan；122 species were found in Middle Subregion of Hengduan Mountains, 26 species in Southern Subregion of Hengduan Mountains, 41 species in Eastern Plateau Subregion of Yunnan, 28 species in Western Plateau Subregion of Yunnan and 25 species in  Southern Mountainous Subregion of Yunnan. The result of cluster analysis is in accordace with that of the principal component analysis, both with two groups clustered：one consists of Southern Subregion of Hengduan Mountains（Ⅱ）， Southern Mountainous Subregion of Yunnan （Ⅴ）， Eastern Plateau Subregion of Yunnan （Ⅲ） and Western Plateau Subregion of Yunnan （Ⅳ）, and the other is Middle Subregion of Hengduan Mountains（Ⅰ）. 【Conclusions】 The distribution of fleas in Yunnan is obviously influenced by environmental conditions of the geographical subregions in Yunnan Province.  

Key words: Siphonaptera, fauna, distribution characteristics, hierarchical cluster analysis, principal component analysis, Yunnan