Abstract：To study the geochemical characteristics of the gas in the soil layer and the tectono-geochemical background, which was reflected by fault gas in the south Anyang fault zone, two periods field measurement are used to analyze the concentration distribution of soil H2 and Rn in the one observation line of Zong village. The results show that the distributions of H2 and Rn concentration in the first phase range from 0.66 to 58.56×10-6 and from 15 to 123 kBq·m-3, respectively. The background values of H2 and Rn concentration are 6.87 ×10-6 and 52.49 kBq·m-3, respectively. The concentration distribution range of H2 and Rn in the second phase range from 0.36 to 29.73×10-6 and from 28.2 to 103 kBq·m-3, respectively, with background values of 0.89 ×10-6 and 47.49 kBq·m-3, respectively. In two phase measurement, a strong anomaly of H2 and Rn appears at 210 to 300 m, with anomalous values located near the fault zone, which could effectively indicate the fracture location. It is feasible to use fault gas H2 and Rn to detect the location of concealed faults in this area.