Abstract:According to the requirements of the project, we undertook research on the activity of QingshankouHuangpi Fault. In this study, we measured gaseous mercury in soil and electromagnetic field along 4 lines accrosing the Fault by XG4 digital mercury analyzer and very low frequency analyzer. The measure data indicate that contenents of intensity of gaseous mercury in soil and electromagnetic is closely related to fault activity. In the active sections of the fault, abnormality of gaseous mercury in soil and electromagnetic field are much higher than that in the stable sections.The results mean that the two methods above can be used not only to confirm the location of faults,but also can be used to analize intensity of an active fault.