Abstract: The “trinitarian” occurrence of dinosaurian skeleton, eggs and footprints and tailprints in the Qiyunshan area, southern Anhui, is rare in the world. This paper describes the morphologies, sizes and structures of five genera and seven species （or indeterminate species） of three major classes of dinosaurs and analyzes the significance of these fossils in stratigraphic division. According to the horizon of the fossils, the age of activity of dinosaurs in southern Anhui is considered to be about 40 Ma B.P.