Abstract: In this paper, by measuring the fault distribution with different natures and faults of different geological ages separately, different kinds of geochemical gas spillover concentrations are measured and special research is carried out. High synchronization is found for the variation of Rn and CO₂ concentration in Suqian fault zone. The concentration anomaly area is consistent with the fault fracture zone. The fault gas concentration in the Suqian section is related to the age of fault activity. The Holocene activity has the highest fault concentration and the Late Pleistocene active fault is slightly lower. The concentration of the early Quaternary fracture concentration is the lowest. This study has important indications for geochemical gas observations in the Suqian section of the Tanlu fault and for earthquake predictions.