Abstract: Saurichthys yunnanensis sp. nov, a new species of Saurichthyidae, is described in this paper. The new species differs from other species of this genus in long and elliptical opercular and the presence of 6 rows of trunk scales. Those fossils come from the Guanling Formation, Ainsian Stage, Middle Triassic in Da'aozi Village, Luoping County, Yunnan Province.