Gardens　plays　an　important　role　in　mitigating　effects　on　the　wind-heat　environment,　and　their　scientific　planning　and　layout　are　of　great　significance　to　the　improvement　of　the　urban　ecological　environment　and　the　local　microclimate　of　the　city.　However,　there　are　few　studies　of　quantitative　analysis　of　the　impact　of　landscaping　and　their　layouts　on　the　urban　wind-heat　environment.　Therefore,　taking　Suzhou　Humble　Administrator＇s　Garden,　Beijing　Summer　Palace,　Suzhou　Jingsi　Garden　and　Beijing　Taoranting　Park　as　study　area,　we　carried　out　a　study　of　3D　spatial　wind　and　thermal　environment　simulation　of　classical　gardens　and　modern　gardens　based　on　high-resolution　remote　sensing　and　computational　fluid　dynamics　(CFD).　The　mitigating　effects　including　cooling　intensity　and　the　maximum　mitigation　distance　are　calculated.　By　analysing　the　overall　of　mitigating　effects　of　classical/modern　gardens　on　the　surrounding　thermal　environment,　we　found　that,　compared　with　the　shape　index,　the　water　area　and　the　area　of　green　planting　are　the　main　factors　affecting　the　wind　and　heat　environment.Comparing　the　quantitative　simulation　results,　it　was　found　that　the　maximum　cooling　value　of　the　Summer　Palace　was　2　&　DEG;C　higher　than　that　of　Taoranting　Park　by　1　&　DEG;C.　The　cooling　distance　in　the　downwind　direction　of　the　Summer　Palace　is　as　high　as　1　km,　which　is　800m　longer　than　that　of　Taoranting　Park.　Comparing　the　influence　of　the　spatial　layout　differences　of　modern　gardens,　the　results　show　that　the　cooling　effect　of　Taoranting　Park　in　Beijing　is　better　than　that　of　Jingsi　Garden　in　the　south.　The　maximum　cooling　value　of　the　Jingsi　Garden　is　only　0.2　&　DEG;C,　and　the　cooling　distance　in　the　downwind　direction　is　200m.