Abstract: Aquifer sedimentology" is a product of crossing and integration of sedimentology, hydrogeology, petroleum accumulation geology and geochemistry and a borderline subdiscipline that is based on sedimentological and hydrogeological theories, with sedimentary aquifers as its object of research, and mainly deals with studies of conditions of groundwater occurrence and circulation, structural characteristics of groundwater systems, quality, origin and distribution of groundwater and regularities of groundwater concentration and finally serves groundwater exploration and assessment. Integrated study of aquifer sedimentology and hydrogeology indicates that under the distinct control of the types and spatial distribution of sedimentary facies the occurrence, circulation and concentration conditions and water quality distribution of Cretaceous groundwater in the Ordos basin are good in the north and poor in the south and good in the lower part and poor in the upper part for the southern part of the basin.