©　2016,　Editorial　Board　of　Chinese　Journal　of　Computational.　All　right　reserved.In　large　eddy　simulations　(LES),　a　flat　ground　model　and　rough　wedge　ground　models　with　different　wedge　heights　were　adopted　to　investigate　near-surface　wind　field　characteristics　under　condition　of　time-varying　upstream　inflows.　In　both　flat　ground　model　and　rough　wedge　ground　models,　simulated　results　show　that　there　is　downdraft　in　peak　period　of　gusty　wind　and　updraft　in　valley　period,　respectively.　Intensity　of　downdraft/updraft　flows　are　related　to　ground　roughness　in　upwind　areas　and　amplitude　of　inflows.　It　follows　that　wind　velocity　and　direction　in　atmospheric　boundary　layer　always　change　over　time　in　time-varying　upstream　inflows,　which　enhances　transportation　of　mass　and　energy　in　actual　atmospheric　boundary　layer.