The western piedmont fault of Gangdeershan is a basin-controlled fault in the Wuhai fault depression. Based on field geological surveys, structural section analysis, and shallow geophysical and geochemical explorations, we analyzed the characteristics of the late Quaternary activity of this fault. Through field geological investigation, fault tracing, and structural profile analysis, we determined that the western piedmont fault of Gangdeershan extends north to south, with the northern end at Guanyinsi, Wuhai city, the southern end at Sandaokan, and further south the presence of a hidden fault. The overall strike of the fault is NNE, the dip angle is 60°~80°, the fault throw is 10~100 cm, and it has both bundle formation and zone formation characteristics. The tectonic activity is strong in the study area, and the elevation difference between the sides of the basin and the mountain is about 400 m. We found the Holocene alluvial sand and gravel deposits to be faulted. The study area is located in the earthquake-free zone and the stress-adjustment transition zone between the northern and southern earthquake areas, and there is a possibility of moderate earthquake activity in the future. Shallow geophysical and geochemical explorations also reveal obvious abnormal changes in the location of faults, and confirm the existence of the fault. The shallow geophysical exploration results show obvious stratigraphic position change and the fault characteristics of bundle formation and zone formation. In addition, most of the faults are high-angle normal faults, and the faults tend to be western. Geochemical surveys mainly employ two methods:soil radon and soil mercury analysis. Based on the above results, we consider the western piedmont fault of Gangdeershan to be a Holocene active fault characterized by tension.