The concentration of soil gas Rn, CO₂ and H₂ were measured cross Jinzhou Fault along totally 8 profiles in the southern area of Liaoning. The results showed that the average concentrations of soil gas Rn, CO₂ and H₂ varied from 10.65 to 39.50kBq/m³, 0.59% to 3.37% and 9.74 to 306.28 ppm, respectively. The distribution of anomaly concentrations of soil gas Rn, CO₂ and H₂ concentrated within the Haicheng, Gaizhou area and its nearby. There exists a clear spatial distribution feature in which the concentration values of soil gases in the northern area of Liaoning were higher than those in the southern region within the study area, which could be attributed to characteristics of the earthquake spatial distribution, low velocity distribution, geological of the observation site and vertical crustal deformation rate. These geochemical characteristics in the study area might be mainly controlled by the seismic activity, crustal structure and vertical crustal deformation, as well as the geological condition on site.