Abstract:In this paper,the concentration of soil gas Hg,Rn,CO2 were surveyed at four sites(Sixian,Mingguang,Feidong,and Tongcheng)in the Anhui section of Tan-Lu(Tancheng-Lujiang)fault zone. The relationship of soil gas geochemical characteristics and the fault location is investigated on the basis of fault gas measurements. The result shows that a large number of gas concentrated near the fault zone and can be used as the best index to the fault location. The gas enrichment degree can be related to the activity of the fault,the lithology and the geological environment in this section. The results have some significance for the research on gas accumulation characteristics and structural geochemical research in the future.