Pervious　concrete　has　good　permeability　and　moisture　adjustment　properties　due　to　its　rich　pore　structure.　It　can　not　only　penetrate　rainfall　to　reduce　surface　runoff,　but　also　retain　a　certain　amount　of　water　inside　then　via　evaporation　to　decrease　surface　temperature.　In　order　to　improve　the　water　retention　of　pervious　concrete　and　prolong　its　cooling　effect,　this　study　introduced　a　modified　method　of　incorporating　biochar　produced　by　pyrolyzing　agricultural　wastes　into　pervious　concrete　as　hygroscopic　filler.　The　effects　of　biochar　on　the　mechanical　properties　of　pervious　concrete　were　analyzed,　then　the　thermophysical　properties,　water　absorption　properties　and　evaporative　cooling　performance　of　biochar-modified　pervious　concrete　with　the　optimum　replacement　rate　were　studied.　The　results　show　that　the　carbonaceous　particles　after　grinding　could　fully　exert　the　filling　and　internal　curing　effects　when　the　replacement　rate　was　less　than　5.0%,　and　effectively　improve　the　mechanical　strength　of　pervious　concrete.　It　was　found　that　the　biochar　addition　had　little　impact　on　the　emissivity　of　pervious　concrete,　while　significantly　reduced　the　reflectivity　and　thermal　conductivity.　Contributing　to　the　abundant　micro-pores　and　higher　specific　surface　area　of　biochar　particles,　it　could　improve　capillary　water　absorption　and　water　storage　ability　of　pervious　concrete.　During　the　evaporation　process,　the　water　absorption　increment　could　effectively　reduce　surface　temperature　of　3-6　℃　and　maintain　evaporation　cooling　effect　for　14-18　h.　©　2023　China　National　Publications　Import　and　Export　(Group)　Corporation.　All　rights　reserved.