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In this paper, 71 species,belonging to 11 subfamily ,39 generae of Lygaeidae Schilling(Hemiptera:Heteroptera:Lygaeidae) from Inner Mongolia ,China,are recorded.Among them, 2 new species(Emblethis alashanensis sp.nov. and Ortholomus mongolicus sp.nov.), 1Chinese new record genera (Raglius Stal)and 2 new Chinese new record species(Hyalocom mongolicus Vinokurov and Drymus orientalis Kerzhner) are described. Some species of Lygaeidae in China are also revised. The male s clasper, genitalia opening,phallus and female’s spermmatheca of 68 species are figured. The faunistic analysis of Inner Mongolia Lygaeidae displayed that the Palaeartic species dominate among all species.The species only belonging to Palaeartic occupy 76.06 percent .In China ,they distribute in Northern-East(67.61%), Northern-China (HuaBei) (59.15%) and Mongolian-Xinjiang (77.46%) regions.