A　multilayer　coupling　model　system　is　developed　by　cooperated　mesoscale　meteorological　model　ARPS　and　air　quality　model　Models-3.　The　construction　fugitive　dust　influence　on　the　air　quality　of　January,　April,　August　and　October　in　2002　of　Beijing　is　simulated,　which　is　based　on　the　detailed　emission　inventory　of　Beijing　city　and　provinces　nearby.　Results　suggest　that　average　pollution　contribution　ratio　of　the　four　months　is　8.82%,　8.25%,　12.14%　and　13.74%　respectively.　The　control　project　that　reduces　the　emissions　of　construction　fugitive　dust　is　proposed　and　the　simulation　results　suggest　that　Beijing　daily　average　PM10　concentration　reduces　8.48　μg/m3　after　the　project　is　carried　out.