To make fully use of FY-2C geostationary satellite in the field of wea ther modification and climate, cloud effective particle radius was retrieved fro m FY2C Channel 4（3.5～4.0μm）data based on the radiative transfer mode, SBDA RT. While comparing to the corresponding MODIS products on TERRA, it is shown tha t FY-2C presents similar distribution patterns of cloud effective radius to MOD IS, but with some differences in particle size. The different retrieval algorithm s, satellite resolutions and channels may be the main factors causing these diff erences between two data sets.