利用改进的卫星3.7 μm通道云粒子有效半径（re）反演算法，基于MODIS和AVHRR观测数据反演了云粒子有效半径（re_o），对比分析了22架次飞机探测获得的大陆性积云的云粒子有效半径，检验了反演算法的可靠性和准确性。检验结果表明：re_o与飞机探测re的一致性很高，反演误差小于2.4 μm，与国际上海洋性层积云的反演误差2 μm接近；re_o与飞机探测re的相关系数达0.79，线性拟合斜率为0.81，而对应的MODIS云产品粒子有效半径（re_p）与飞机探测结果的相关性较低，最大相关系数和线性拟合斜率分别为0.43和0.32，相对而言，re_o的准确性更高；re_o随温度（高度）的分布与飞机探测re随温度的变化趋势吻合。这些表明re_o反演算法可靠，反演精度较高。当卫星天顶角较大时，可能导致有效半径的过估，应用中需考虑卫星天顶角的影响，避免卫星观测位置的过度偏离，以确保反演精度。

Objective: Cloud is the most concern of weather, climate, weather modification and environment. It is crucial to obtain cloud microphysical parameters and properties from satellite observation of clouds. They can help to further understand the vertical structure of clouds and the formation of cloud and precipitation, and to quantitatively assess aerosol-cloud-precipitation interactions and radiation climate effects of clouds. They also have significant application potential for identifying and warning strong convection, as well as evaluating the effects of weather modification. It is necessary to validate the accuracy of retrieved microphysical parameters such as cloud droplet effective radius (re), phase and the vertical structure of clouds. Method: Based on our developed retrieval system and improved methodologies of cloud microphysical properties from satellite, 3.7 μm channel data with multi-channel combination from MODIS and AVHRR satellite is used to retrieve cloud droplet effective radius and their vertical structure, which are compared with that from 22 airborne measurements of continental cumulus clouds and with re from MODIS cloud products, the accuracy and the reliability of satellite retrieval are accessed by means of these comparisons. Result: The comparisons show that the error of droplet effective radius between the retrieval and the airborne measurements is less than 2.4 μm, which is very close to 2 μm of international verification results within marine stratus. The distribution of re with temperature/height (vertical structure) is quite consistent with that detected by aircraft measurement. The retrieved re from the 3.7 μm has a high correlation with the airborne measurement, with a correlation coefficient of 0.79 and a linear fitting slope of 0.81. However, the re from MODIS cloud product has a low correlation with the airborne measurement, the correlation coefficient and linear fitting slope are 0.43 and 0.32, respectively. All these suggest that the high accuracy of retrieved cloud droplet effective radius and the high reliability of the retrieved methodologies. When the zenith angle of a satellite is large, it may lead to overestimation of re. In application, it is necessary to consider the influence of the zenith angle of the satellite to avoid excessive deviation of the satellite observation position and ensure retrieval accuracy.