Abstract:In this paper, the soil radon(Rn) concentration of the Gaoqiao fault zone is measured. The soil radon concentration characteristics of two lines in Gongjiaqiao and Zhongyangpo are analyzed, and the results, combined with the structural sections, shows the location, scale and other characteristics of the fracture. The results show that the background values of radon concentration in soil are 34 138 Bq/m3 and 26 960 Bq/m3. The lower limits of the high value are 53 580 Bq/m3 and 53 322 Bq/m3, and the anomalous areas indicate that the fracture at Gongjiaqiao is not more than 60 meters and not less than 40 meters at Zhongyangpo.