Trees　and　their　morphology　can　mitigate　the　urban　heat　island　(UHI)　effect,　but　the　impacts　of　tree　species　and　their　two-dimensional　(2D)　and　three-dimensional　(3D)　morphological　characteristics　on　the　thermal　environment　of　residential　spaces　at　the　building　scale　have　not　been　effectively　evaluated.　This　research　extracted　the　data　of　trees　in　the　spatial　range　of　a　50　m　radius　of　the　sampling　sites　located　in　a　subtropical　humid　city＇s　residential　area　based　on　unmanned　aerial　vehicle　(UAV)　imagery　and　field　measurements.　It　included　Ficus　microcarpa　L.　f.,　Cinnamomum　camphora　(L.)　J.　Presl,　and　Alstonia　scholaris　(L.)　R.　Br.　as　three　typical　evergreen　tree　species　and　six　quantitative　indicators　of　trees,　with　the　number　of　trees　(N)　serving　as　fundamental　indicator　and　mean　canopy　width　(MCW),　mean　canopy　height　(MCH),　mean　tree　height　(MTH),　canopy　biomass　(CV),　and　mean　canopy　biomass　(MCV)　as　morphological　characteristic　indicators.　We　analyzed　the　impact　of　the　six　indicators　above　on　two　thermal　environment　parameters:　Air　temperature　(AT)　and　relative　humidity　(RH),　by　correlation　analysis　and　multiple　linear　regression　analysis.　Results　showed　that:　(1)　F.　microcarpa,　as　a　dominant　local　species,　provided　more　than　65%　of　the　tree　canopy　volume　within　the　study　area　(50　m　radius　buffer　zones),　and　its　contribution　to　cooling　and　humidification　effects　was　superior　to　those　of　C.　camphora　and　A.　scholaris.　(2)　The　MTH　and　CV　of　F.　microcarpa　are　the　key　factors　influencing　daytime　AT　and　RH,　respectively,　with　temporal　fluctuation　in　impact　intensity　during　the　spring　(May)　daytime.　(3)　The　MTH　and　N　of　F.　microcarpa　show　the　best　cooling　effect　(adjusted　R-2　=　0.731,　p　＜　0.05)　during　midday　(13:00-14:00　p.m.),　while　its　CV　and　MTH　have　the　best　humidification　effect　(adjusted　R-2　=　0.748,　p　＜　0.05)　during　the　morning　(9:00-10:00　a.m.)　among　three　typical　tree　species.　The　2D　and　3D　morphological　characteristic　indicators　effectively　describe　the　impact　and　variation　of　tree　species　on　the　spring　microclimate　within　small-scale　residential　spaces.　This　work　provides　new　insights　into　the　thermal　benefits　brought　by　the　spatial　growth　features　of　trees　at　the　building　scale　and　offers　reference　for　urban　residential　areas　in　the　planning　and　management　related　to　tree　species　selection,　canopy　maintenance,　and　the　improvement　of　thermal　comfort　for　inhabitants.