Pervious　concrete　can　reduce　the　surface　temperature　and　improve　the　outdoor　environment　through　its　own　evaporation　capacity.　The　unique　pore　structure　makes　pervious　concrete　different　from　ordinary　concrete　and　has　a　great　impact　on　its　macro　performance,　such　as　mechanical,　penetration,　fatigue,　durability,　noise　reduction　performance.　In　this　study,　the　correlation　between　water　evaporation　rate　and　pore　structure　parameters　of　steel　slag　pervious　concrete　(SPC)　was　analyzed,　and　an　empirical　model　formula　was　proposed　to　characterize　the　water　evaporation　rate　at　different　evaporation　time.　Evaporation　experiments　at　different　temperatures　and　different　specimen　heights　were　designed,　and　the　evaporation　of　each　specimen　was　obtained.　The　porosity　and　surface　porosity　of　each　specimen　were　determined　by　water　replacement　method　and　computed　tomography　(CT)　scanning.　The　results　show　that　the　evaporation　and　initial　evaporation　rate　of　SPC　increase　with　the　increase　of　specimen　height　and　temperature.　The　relationship　between　evaporation　rate　and　evaporation　time　conforms　to　the　exponential　function　distribution,　showing　a　rapid　decline　stage　and　a　gentle　decline　stage,　with　obvious　inflection　points.　The　pore　size　distribution　and　sphericity　of　SPC　were　analyzed,　and　its　influence　on　evaporation　rate　was　negligible.　With　the　increase　of　height　ratio,　the　tortuosity　of　SPC　increases　relatively,　while　the　surface　porosity　decreases.　The　evaporation　rate　model　of　SPC　considering　the　influence　of　specimen　height,　temperature,　tortuosity　and　surface　porosity　is　constructed.　The　research　is　helpful　to　improve　the　ecological　design　of　SPC　pavement　and　promote　the　application　of　SPC　materials.