Abstract: The study aims to take full advantage of weather radar, cloud particle measuring systems (DMT) and advanced detection equipment, such as satellite, establish recognized technology in time, and decide when and where to conduct artificial rainfall. By using the April 20, 2010 DMT cloud particle measuring system detection data of stratiform cloud stage of Shanxi Province, the author analyzed the cloud microphysical characteristics and precipitation mechanisms. The results showed that the detected cloud had a multilayer structure, there were 3 layers in vertical direction, 2 dry layers were sandwiched between clouds, cloud thickness was about 4500 m and more profound, the high-rise was Cs, the low layer was the cold resistance of As and Ns, precipitation mechanism was in accord with the natural "sowing-water supply". In 5400-5600 m layer, the temperature was -9- -11.2℃, as the rapid cloud particle growth layer, the sublimation of ice growth and aggregation growth were the important physical processes. Around 3600 meters, large supercooled water for precipitation particle growth provided a good condition, 2800-3200 m layer (near 0℃ layer) was melting and coalescence growth layer. From high to low layer, cloud particle spectra had good regularity. The aircraft observations of cloud result showed that stratocumulus particle spectra were mainly unimodal before the rainfall, bimodal at the initial formation of the rainfall. Large droplets and some small ice particle spectra showed a multimodal distribution, and the emergence of the discontinuous phenomenon was obvious when it was less than 800 μm. Based on integrated analysis of the cloud data, the particle concentration that CDP detected is stable in the larger spatial, there are few ups and downs, while the corresponding particle concentration that CIP detected is less than 10 /L, such a cloud is more favorable for artificial precipitation.