Vertisols were proved in this work to be not modern soils but paleosols from the characteristics of genetic horizons in soil profile, soil ages and environmental changes in terms of pollen analysis, paleontologic fossils and radiocarbon dating.The paleosols have undergone 3 sedimentation-soil formation cycles since late Pleistocene, being weak in the degree of soil development.In fact, the paleosols found in the Huang-Huai-Hai Plain are a superimposed paleosol consisting of calcareous concretion soil horizon, dark soil horizon, topsoil horizon and/or warped horizon.