With　the　proposal　of　carbon　peak　and　carbon　neutrality　and　the　development　of　the　new　power　system,　how　to　reduce　the　carbon　emissions　in　the　power　industry　and　alleviate　the　funding　gap　of　the　renewable　energy　subsidies　are　two　major　issues　at　present.　Therefore,　this　paper　establishes　a　carbon-green　certificate-electricity　energy　market　coupling　trading　optimization　model.　In　this　model,　all　the　power　producers　participate　in　the　bidding　in　the　electricity　market　with　the　marginal　cost　of　generation.　Considering　the　influence　of　the　carbon　emission　trading　costs　and　the　green　certificate　trading　costs　on　the　quotation　of　the　power　producers,　after　the　unified　clearing　of　the　electricity　and　energy　market,　the　optimal　bid-winning　power,　the　carbon　quota　benchmark　coefficient　and　the　green　certificate　proportion　coefficient　of　the　generator　are　obtained　so　as　to　minimize　the　electricity　purchase　cost　under　the　premise　of　limiting　the　total　regional　carbon　emission　and　encouraging　the　renewable　energy　to　participate　in　the　market　competition.　At　the　same　time,　the　model　provides　a　reference　for　the　regulatory　department　to　formulate　the　carbon　emission　quota　coefficient　and　green　certificate　proportion　coefficient.　Secondly,　this　paper　linearizes　the　model　and　uses　the　Cplex　to　find　the　Lagrange　dual　variables　of　the　model　constraints　in　order　to　study　the　changes　of　the　marginal　costs　of　the　carbon　emissions　and　the　marginal　costs　of　the　green　certificate　under　different　carbon　quota　benchmarks　and　green　certificate　ratios,　and　to　reveal　the　internal　mechanism　of　the　impact　of　the　carbon　market　and　the　green　certificate　market　on　the　electric　energy　market.　Finally,　an　example　is　given　to　analyze　and　compare　the　optimization　results　of　the　coupled　trading　mechanism　with　the　single　power　market,　which　shows　that　the　carbon-green　certificate-electricity　coupling　optimization　mechanism　plays　a　role　in　increasing　the　consumption　of　the　renewable　energy　and　reduce　the　carbon　emissions　significantly.　©　2023　Power　System　Technology　Press.　All　rights　reserved.