Urbanization　has　brought　about　a　substantial　increase　in　population　growth,　and　a　considerable　amount　of　park　green　space　has　been　exposed　to　urban　construction　land,　which　has　greatly　affected　the　natural　and　social　value　of　the　urban　natural　capital.　Although　this　problem　is　serious　in　developing　countries　such　as　China,　few　studies　have　been　conducted　on　the　basis　of　a　comprehensive　evaluation　of　urban　natural　areas.　This　study　evaluates　the　ecological　services　value　of　urban　wetland　parks　from　two　perspectives:　1)　the　urban　economic　development　brought　by　urbanization　has　an　obvious　artificial　influence　on　an　urban　park＇s　economic　value　and　2)　the　wetland　ecosystem　plays　an　important　role　in　regulating　and　improving　the　surrounding　urban　environment.　A　flexible　evaluation　step　model　and　a　series　of　quantitative　evaluation　methods　was　constructed　and　used　in　a　case　study　of　Aha　Lake　National　Wetland　Park　in　Guiyang,　China,　based　on　a　comprehensive　analysis　of　the　social,　economic,　and　ecological　values　of　the　park.　The　results　show　that　the　total　ecosystem　service　value　of　Aha　Lake　National　Wetland　Park　is　1.92x10(9)　yuan.　This　article　has　two　main　purposes:　1)　serving　as　an　innovative　quantitative　evaluation　method　of　key　indicators　and　2)　establishing　a　framework　of　ecosystem　services　value　evaluation　for　urban　parks　based　on　the　cascade　model.