This　paper　selects　two　streets　with　different　orientations　and　different　aspect　ratios　as　the　research　area,　using　ENVI-met　software　to　simulate　the　effect　of　trees＇　canopy　occupation　on　thermal　comfort　at　the　pedestrian　height.　The　results　show　that　the　trees＇　canopy　occupation　ratio　(TCR)　influences　the　average　air　temperature.　Tree　planting　raises　air　temperature　both　at　noon　and　afternoon,　while　dropping　it　in　the　morning.　For　the　two　streets,　when　TCR　is　greater　than　a　certain　value,　continuing　to　increase　trees＇　canopy　occupation　has　no　significant　impact　on　air　temperature.　Therefore,　larger　canopy　occupancy　of　trees　does　not　necessarily　cool　air　temperature.　More　treeing　even　worsens　the　thermal　comfort,　especially　in　the　streets　with　a　large　aspect　ratio.　©　2022　IEEE.