Abstract: The CAMS meso-scale cloud model is introduced and operationally applied since 2009 in Shanxi Province. The macro and micro structure of stratiform precipitation clouds, especially the vertical micro-physical structure are simulated and analyzed for a spring stratiform precipitation process in Shanxi Province on 20 April 2010 using the model. Two cloud physical detection flights are carried out by using weather modification plane with equipments of droplet measurement technologies (DMT) in the same place during the same period of the day. The data and images from flight detection and results of numerical simulation are compared and studied. Simulation results show that the precipitation process mainly comes from cold stratiform cloud. The cloud contains a lot of supercooled water, and the thickness of the rich supercooled water layer is about 4000 meters. The temperature of the supercooled layer is about 0 to-40℃, and the ratio content of the supercooled cloud water is about 0.1—0.7 g·kg^-1 with some ice crystals distributed unevenly. The structures of stratus precipitation cloud can be roughly divided into three layers. The first layer (upper layer) is mainly composed of ice crystals; snow, sleet and supercooled cloud water are mixed in the second layer (middle layer); and the third layer (lower layer) is mainly of liquid raindrops. The vertical distribution and the transformation of different hydrometers in different stages of the precipitation are analyzed. The precipitation mainly comes from the melting of the ice phase particles such as ice crystals, snow, sleet and the transformation of liquid cloud droplets. Comparison of the numerical simulation results and the plane observation shows that the temperature and altitude relationship are in good agreement. The simulated vertical structure of the different cloud particles phase and the vertical distribution of the cloud liquid water ratio content are nearly the same as the vertical distribution of different cloud particles images and the cloud liquid water content of the flight detection. The difference is that the simulated height where various hydrometeors appears is higher than the actual flight detection.