Abstract: To address issues associated with scintillation chamber radon measurement instruments-such as complex observation procedures, time-consuming background reduction, inaccurate solid-source activity, imprecise instrument calibration, and cumbersome calculation processes. Jiayuguan seismic monitoring station conducted experimental research using the DDL-1 gas radon meter. The study compared the DDL-1 gas radon meter with the FD-125 radon-thoron analyzer in terms of working principles, key technical parameters, calibration procedures, and data stability. The results indicate that the DDL-1 gas radon meter offers significant advantages in instrument calibration, with simplified operation and automatic K-value calculation, effectively shortening calibration time. Under fixed time and quantitative observation modes, the observation curves of both instruments were synchronized, and the DDL-1 detector operated stably. However, despite notable improvements in background reduction, the DDL-1 gas radon meter still faced challenges in reducing background levels under high temperatures. Additionally, during continuous measurements, the detector’s readings consistently declined, and its air inlet pipes were prone to freezing in winter, which prevented year-round continuous observations. Consequently, the DDL-1 gas radon meter is not yet suitable for daily continuous monitoring of radon in the Jiayuguan fault.