Weiningbeishan, Ningxia, is located at the convergence zone among three active blocks, i.e., the Tibetan Plateau, the Alax Block, and the Ordos Block. Detection of the active faults in this area is of great significance for clarifying the boundary of active blocks and planning the layout of Zhongwei Industrial Park. By means of shallow seismic exploration, drilling joint profile exploration, and trenching, this paper carried out a comprehensive exploration on the inferred fault at the southern margin of Weiningbeishan, found out the fault distribution and the characteristics of stratum dislocation, and preliminarily identified the activity of the proved fault. The results show that the normal southern margin fault of Weiningbeishan under the geomorphic scarp inferred by former researchers is not found, and a thrust fault is developed in the bedrock to the north of the geomorphic scarp. The shallow seismic exploration profile reveals that the buried depth of upper breakpoint of the fault is 35-40 m. The drilling joint profile surveying and tren-ching found that the fault offset the Carboniferous and Oligocene strata, however, the overlying Late Pleistocene sediments are not faulted, indicating the fault is not active. In addition, the shallow seismic profile reveals that a NWW-trending buried normal faultis developed in the Zhongwei basin, and the buried depth of upper breakpoint is 60 m. Combined with the stratigraphic age of the basin, we infer that the fault has not been active since the Late Pleistocene.