To reveal the influence of polluted aerosol on severe freezing weather,especially the freezing rain,we studied the freezing weather occurred during 18—21 January 2008 by using WRF.The results show that the polluted aerosol suppress regional precipitation,especially the process of severe freezing rain.The microphysical process shows that the formation of freezing rain in Guiyang is caused by supercooled cloud mechanism(warm cloud mechanism).The polluted aerosol increases the rainwater mixing ratio and ice particles concentration and reduces the content of supercooled rain,resulting in solid precipitation on the ground and suppressing freezing rain.