Detection of the radon concentration in fault gas is the method commonly employed in the study of active faults, but this method has been seldom applied in plateau areas. In the detection and evaluation of the active faults in Shigatse City, Tibet, we determined the fault-gas radon anomaly characteristics by comparing the fault gas detection results with those from shallow artificial seismic detection. Our analysis results show the detection of radon gas to be an effective method for determining the location of buried faults in a plateau area, and that the fault activity could be preliminarily determined based on abnormal changes in the radon concentration in addition to other exploration methods.