In　order　to　scientifically　assess　the　impact　of　land　use/cover　changes　on　carbon　cycle　of　coastal　blue　carbon　wetland　ecosystem，it　is　important　to　reveal　the　effect　of　conversion　of　estuarine　marshes　to　aquaculture　ponds　on　soil　extracellular　enzyme　activity　and　greenhouse　gases　production.　Soil　samples（0~30cm）from　the　Phragmites　australis　marshes，Cyperus　malatensis　marshes　and　Spartina　alterniflora　marshes，and　0~30　cm　sediment　samples　from　the　shrimp　ponds　reclaimed　from　the　above　marshes　were　collected　in　the　Min　River　estuary.　The　soil/sediment　extracellular　enzyme　activity，and　CO2，CH4　production　potentials　were　measured　via　anaerobic　incubation　experiment.　Compared　with　the　marshes，the　average　value　of　activity　of　4　extracellular　enzymes　in　the　shrimp　ponds　decreased　by　27.3%.　The　production　potentials　of　carbon　greenhouse　gases　significantly　changed　after　estuarine　marshes　converting　to　shrimp　ponds.　The　CO2　production　potentials　of　the　P.　australis　marshes，C.　malaccensis　marshes，S.　altemiflora　marshes　increased　by　5.1%，38.5%　and　38.8%，respectively，and　the　CH4　production　potentials　reduced　by　24.9%，11.1%　and　21.1%，respectively，and　the　organic　carbon　anaerobic　mineralization　rates　increased　by　4.9%，38.6%　and　38.4%，respectively.　The　SOC　content　was　key　factor　affecting　the　soil/sediment　extracellular　enzyme　activity.　The　extracellular　enzyme　activity　and　conductivity　were　main　factors　controlling　organic　carbon　anaerobic　mineralization　rate　of　the　marshes　soils　and　shrimp　ponds　sediments，respectively.　The　study　results　show　that　conversion　from　marsh　to　shrimp　ponds　in　the　Min　River　estuary　increase　organic　carbon　anaerobic　mineralization　rate，which　may　cause　more　loss　of　soil　organic　carbon，and　is　unfavorable　to　reach　carbon　goal　of　peak　and　neutrality　and　to　mitigate　global　climate　warming.　©　2023　Science　Press.　All　rights　reserved.