Blue　and　green　spaces　(BGSs)　are　used　as　the　important　resource　to　mitigate　urban　heat　island　(UHI)　effect　through　their　cooling　effect.　However,　research　on　the　supply　and　demand　of　cooling　effect　of　BGSs　is　limited.　This　study　used　the　Fujian　Delta　urban　agglomeration　of　China　as　the　study　area.　Based　on　multi-source　data,　we　constructed　the　evaluation　indicator　system　to　quantify　the　supply　capacity　of　cooling　effect　(CESC)　and　the　demand　level　of　cooling　effect　(CEDL),　and　revealed　the　law　of　spatial　distribution　and　changes　in　the　CESC　and　the　CEDL.　Moreover,　we　further　analyzed　the　correlation,　matching　state　and　coupling　coordination　degree　(CCD)　between　the　CESC　and　the　CEDL.　The　results　showed　that　(1)　in　the　study　area,　the　CESC　has　a　spatial　distribution　with　a　decreasing　gradient　from　the　inland　BGSs　with　high　elevations　to　the　coastal　urban　areas,　while　the　CEDL　exists　the　opposite　trend.　The　CESC　is　negatively　correlated　with　the　CEDL,　and　there　is　a　clear　spatial　spillover　effect.　(2)　The　matching　state　between　the　CESC　and　the　CEDL　exhibits　obvious　polarization.　An　increasing　number　of　areas　might　face　shortage　of　cooling　effect　supply.　(3)　The　CCD　between　the　CESC　and　the　CEDL　is　in　a　state　of　low　coordination　level.　In　eastern　coastal　urban　areas,　the　incoordination　of　the　CESC　and　the　CEDL　become　serious　increasingly.　(4)　In　areas　with　＇low　supply-high　demand＇　and　incoordination,　the　intensity　of　urban　construction　and　the　size　of　population　should　be　controlled,　and　the　BGSs　should　be　improved　to　enhance　the　CESC.　Meanwhile,　in　areas　with　＇high　supply-low　demand＇　and　incoordination,　spatial　structure　of　land-use/land-cover　should　be　optimized　to　improve　the　efficiency　of　cooling　effect　utilization.　This　research　can　provide　a　new　perspective　and　scientific　basis　for　the　BGSs　layout　in　order　to　achieve　the　mitigation　of　UHI　effect.