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The aircraft DMT observation data from a stratus cloud precipitation on 14 May 2010 are analyzed. The results show that the main microphysical mechanism in the precipitation was a “seeder feeder” process. The concentration of precipitating particles in the ice layer was higher than those in the other layers. Ice and water particles coexisted in the supercooled layer, which had abundant liquid water content (LWC), was favorable for the ice water transformation and ice riming growth and was a crucial layer for precipitation. The mechanism of this precipitating cloud was a typical “seeder feeder” process, but the precipitating cloud had the characteristics of high cloud base, thin warm level, thick evaporation layer and lacking of warm rain growing process, so that there was no strong rainfall.