Abstract: The present paper is a revision of the genus Topomyia of China.Totally 16 valid species, mainly from Yunnan and with a few from Guizhou, Guangxi, Xizang and Taiwan, including 3 new species, are mentioned. The 16 species, belonging to 2 subgenera, are as follows: baolini, bifurcata, hirtusa, inclinata, lindsayi, longisetosa, margina sp. Nov., svastti, sylvatica and zhangi of subgenus Topomyia and bannaensis sp. Nov., cristata, dulongensis sp. Nov., houghtoni, mengi and yanbarensis of subgenus Suaymyia. Keys for the identification of the above speciesare given. All types are deposited in the Institute of Epidemiology of Yunnan Province.Beijing 100850)Abstract The present paper is a revision of the genus Topomyia of China.Totally 16 valid species, mainly from Yunnan and with a few from Guizhou, Guangxi, Xizang and Taiwan, including 3 new species, are mentioned. The 16 species,belonging to 2 subgenera, are as follows: baolini, bifurcata, hirtusa, inclinata, lindsayi, longisetosa, margina sp. Nov., svastti, sylvatica and zhangi of subgenus Topomyia and bannaensis sp. Nov., cristata, dulongensis sp. Nov., houghtoni, mengi and yanbarensis of subgenus Suaymyia. Keys for the identification of the above species are given. All types are deposited in the Institute of Epidemiology of Yunnan Province.