Through primary study on the former test result of soil mercury gas measurement in Zouping volcanic rocks area, among 24 spots mercury gas measurement anomalies, 8 spots have been verified by drilling prospecting, and few spots has the significance of further work. Soil mercury vapor measurement anomalies are accordance with copper halo anomalies in the boreholes, and have a close relation with copper and metal sulfides. Thus, soil mercury gas measurement is completely feasible in prospecting hidden polymetallic sulfide deposits in Quaternary covering areas.