Radio Occultation data are of great value in numerical weather forecasting and climate monitoring. This study evaluates the deviation characteristics of occultation data from the FY-3E/GNOS and COSMIC-2 satellites with ERA5 reanalysis data. The results indicate that FY-3E/GNOS and COSMIC-2 exhibit high consistency with ERA5 in the altitude range of 5 km to 30 km，with refractivity deviations less than 1% and bending angle deviation is stable within ±0. 4%. However，in the lower atmosphere（below 5 km），COSMIC-2 presents a maximum negative bias of -1. 2% at altitudes below 4 km，while FY-3E/GNOS demonstrates a systematic positive bi‐ as below 5 km in the bending angle，and the refractivity shows negative deviations below 2 km in the low-latitude region and positive deviations from 2 to 4 km. Research findings indicate that the bending angle profiles of FY-3E/GNOS are smoother than those of COSMIC-2，especially in the lower troposphere.