Abstract: In order to explore the similarities and differences in the meteorological characteristics of radiation fog between Tianfu and Shuangliu airports, the meteorological characteristics of the radiation fog on January 9, 2022 at both airports were compared by using the data of automatic meteorological observation system, airport manual observation data and ERA5 reanalysis data. The rusults show that the basic temperature at Shuangliu Airport was slightly lower, with better humidity condition, and a significant inversion layer formed in the early stage, leading to an earlier fog formation. During the later stages of the radiation fog process, the temperature rose due to the influence of low clouds at Shuangliu Airport, and the temperature rise range was large. The near-surface water vapor flux diverged and there was no water vapor supplement. At the same time, the wind speed at the end of the 02R runway increased significantly after 04 : 00, and the disturbance was strengthened, which was not conducive to the maintenance of fog. The temperature rise of Tianfu Airport was smaller than that of Shuangliu, and the water vapor flux convergence was maintained near the ground, with water vapor replenishment, and the wind was also weak, which was conducive to the maintenance of fog.