Abstract: The horizontal zonal characteristics of hydrochemical type in groundwater with three circulation depths of shallow, middle and deep level have been studied in the Ordos Cretaceous Artesian Basin on the basis of analyzing 1 125 hydrochemical samples. On the whole, in the north of the basin, the hydrochemical type is mainly HCO₃ with atypical horizontal zonal characteristic in shallow, middle and deep groundwater in east of Anbian-Sishiliang-Dongshengliang beam. While the hydrochemical types have a typical zonal characteristic along flow direction of groundwater in shallow, middle and deep groundwater of Molin River-Yanhaizi groundwater regime and Dusitu River-Yanchi groundwater regime. In the south of the basin, groundwater flows hierachically and the hydrochemical types are complex. The distribution rules are follows: the center rule is Dingbian-Huan town-Heshui-Huachi-Wuqi-Dingbian, while the north rule is from the south to the north, the east rule is from the west to the east, and the south rule is from the southwest to the northeast.

Key words: groundwater, hydrochemical, distribution law, Ordos Cretaceous Artesian Basin