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Based on the data from meteorological satellites, the macrophysical and microphysical characteristics of the stratocumulus cloud system on 20 May 2019 are analyzed by using the cloud physical data from DMT (Droplet Measurement Technologies) and SPEC (Stratton Park Engineering Compang). The results show that the maximum particle number concentrations of CDP (Cloud Droplet Probe) and CIP(Cloud Imaging Probe) were 362.10 cm-3 and 191.08 L-1, respectively. The content of liquid water ranged from 0 to 0.88 g/m3. The spectral distribution shows that the particle spectra of CDP and CIP exhibited exponentialtype decline. The spectral width of the CDP particle spectrum is narrow. The spectral width of the CIP particle spectrum is narrow on the top of clouds while the lower layer is wide. The observed results of CPI show that the upper stratocumulus was mainly composed of ice and snow particles, which were dominated by nucleation and coagulation growth of ice crystals. The upper and middle particles were mainly composed of small ice crystals, some ice crystal polymers and dendritic ice crystals. The middle and lower parts were composed of supercooled water and ice crystal particles, with rich supercooled water.