Abstract:A squall line occurred in east China during 12 July 2014 was simulated with the Weather Research and Forecasting (WRF) model using spectral bin and two-moment bulk microphysical parameterization scheme respectively. By comparison with the observed radar reflectivity, the bulk scheme has basically reproduced the initiation, developing, maturing and dissipating processes of squall line although it occurred two hours later than observation. While the bin scheme simulated a less-organized radar structure with relatively isolated convective cells in the leading edge. As for the surface rainfall, the strong rainfall areas were better simulated by bulk scheme despite it underestimated the precipitation in southwestern part of the rain band. By comparison the bin scheme produced a thinner rain band. The statistics of hydrometeor mixing ratio revealed a large amount of ice particles were produced in bulk scheme, while snow particles dominated at upper levels in bin scheme. In summary, the traditional bulk scheme seems to have a better performance than newly-incorporated bin scheme in WRF model in our case study. But detailed analysis and sensitivity tests are needed in future to further investigate the possible mechanisms that responsible for the distinctive results.