Hustai National Park is located 95 km West of Ulaanbaatar, in Hentei Mountain area, mostly at 1300-1500 m elev., max. = 1843 m. Moss flora of Hustai includes 98 species. Annotated list provides information on habitats and substrate for each species and distribution within the area. The research revealed that in the area among common species are Bryum algovicum, Haplocladium angutifolium, Tortula pagorum, T. submontana, Eurohypnum leptothallum, Brachythecium rotaeanum, Fabronia ciliaris, Didymodon gaochienii, Orthotrichum iwatsukii.