Rapid　urbanization　has　changed　the　structure　of　urban　land　use　which　has　led　to　changes　in　evaporation　rates　in　urban　areas.　Evaporation　mechanisms　include　the　common　evaporation　from　the　underlying　urban　surface　as　well　as　evaporation　inside　buildings.　Urban　surfaces　can　be　divided　into　road,　green　spaces,　water　surfaces　and　buildings.　This　paper　analyzes　evaporation　rates　for　the　urbanization　levels　in　six　Beijing　districts　during　2000,　2015　and　2018.　Both　natural　evaporation　and　the　water　dissipation　inside　buildings　are　considered　to　analyze　the　impact　of　urbanization　and　non-capital　functions　relief　on　the　urban　regional　evaporation.　The　results　show　that　urbanization　significantly　enhances　the　evaporation　from　urban　construction　land　and　the　population　density　is　the　key　factor　affecting　the　evaporation.　The　deconstruction　of　the　non-capital　function　reduces　the　urban　social　water　use　and　the　urban　regional　evaporation.　This　analysis　of　the　contributions　from　the　various　underlying　surfaces　to　the　regional　evaporation　shows　that　buildings　and　green　spaces　provide　most　of　the　evaporation.　©　2022　Press　of　Tsinghua　University.　All　rights　reserved.