Abstract: Wawusi mining area (coal-bearing basin) is a faulted depressed coal-bearing basin of NW strike with faults as boundary in both the south and the north. By resistivity method, we discovered that the contour line of apparent resistivity is the densest around the outcrops of coal seams in the mining area, and we inferred the directional fault (DF2). However, two questions are very controversial:whether the fault exists, and how the occurrence of the fault is. In this paper based on Mohr strength theory of rock mass deformation and failure, we made use of joint stress field analysis, hemispherical projection method and fault assemblage analysis to infer that the fault(DF2) is a part of the second fault, and determined the occurrence of the fault (DF2). Also, we took advantage of thickness of strum and deformation features and so on around the fault (DF2) to judge the existence of the fault (DF2). The result has a positive guiding significance for structural analysis in coal-bearing faulted basin of middle Cenozoic and the general coal reconnaissance in the mining area.