Abstract: Using observational data from aircraft, satellites, and radars, as well as CMA-CPEFS v2.0 model dataoutput, this study analyzes the cloud microphysical characteristics of an aircraft icing event that occurred on 10 May 2024, over the Danjiangkou Reservoir—the water source area of the middle route of the South-to-North Water Diversion Project in Hubei Province. Aircraft-based observations revealed rapid ice accretion of up to 5 cm under conditions of temperatures ranging from −12°C to −5°C and supercooled liquid water content between 0.2 and 0.4 g m⁻³. The ice gradually melted as temperatures rose above −5°C. Ground-based Ka-band cloud radar data indicated that radar reflectivity increased from −13.5 dBZ at an ice thickness of 5 cm to −4 dBZ at 4 cm. This finding suggested that icing intensity and radar reflectivity were not entirely consistent, with supercooled water content as the dominant influencing factor. Compared with satellite retrieval products, the CMA-CPEFS v2.0 model more effectively simulated the eastward movement and intensity of the system. However, discrepancies were observed in the location, intensity, and cloud band forecasts, all of which need to be corrected based on the observed data.