Soil gas radon is a valuable indicator for assessing fault activity and identifying concealed faults, making it an important tool in tectonogeochemical research. This study analyzes soil gas radon data collected in September 2024 from 104 measuring points along 10 survey lines in the Anqiu-Juxian fault zone, Shandong Province, to reveal its geochemical characteristics and tectonic implications through statistical analysis, multi-dimensional comparison, and mechanistic interpretation. Results show that radon concentrations range from 1930 to 74300Bq/m³, displaying a general “north-high, south-low” spatial pattern. The overall distribution approximates normality but contains extreme values associated with faults. Survey line profiles exhibit diverse morphologies:single peaks correspond to individual faults, whereas double or multiple peaks reflect multi-segment radon enrichment zones, consistent with fault and fold structures. In terms of segmentation, the northern section(Changyi-Fangzi-Anqiu) shows a higher background value(33072Bq/m³) than the southern section(11663Bq/m³), while the southern section displays a higher extreme-value ratio(3.16 vs. 2.25), suggesting that the north is characterized by more developed fractures, whereas the south exhibits stronger localized stress concentration. The spatial distributions of radon, CO₂, and H₂ are highly consistent. Comparison with 2017 data reveals an increase in the extreme-value ratio in the Tancheng segment, potentially indicating elevated stress. Overall, the results suggest that radon distribution is controlled by geological structures(strata and fault geometry), seismic activity(frequent earthquakes in the southern section), and meteorological conditions(rainfall) . These findings provide important geochemical evidence for evaluating fault activity and seismic risk in the Anqiu-Juxian fault zone.