With　the　rapid　development　of　new　electricity　system,　how　to　explore　the　dispatch　potential　of　various　types　of　generation　resources　between　transmission　and　distribution　networks,　unleashing　the　carbon　reduction　capacity,　improving　the　operation　quality　of　the　system　has　become　a　major　research　hotspot.　Therefore,　this　paper　proposes　an　electricity-carbon　coupled　model　considering　transmission　and　distribution　synergy.　First,　a　two-stage　market　clearing　model　is　established　for　the　clearing　needs　of　different　markets:　the　first　stage　of　the　model　is　mainly　for　the　allocation　of　unit　carbon　quotas.　The　second　stage　utilizes　the　carbon　allowances　of　the　units　obtained　in　the　first　stage　to　clear　the　electricity　carbon　market　and　obtain　the　day-ahead　baseline　generation　schedules.　Second,　to　safeguard　data　privacy　of　the　transmission　and　distribution　coupled　system,　the　idea　of　decomposition　and　synergy　is　used　to　decouple　the　transmission　and　distribution　coupled　system　to　solve　each　market　clearing　model.　Finally,　the　T39D　2　×　17　example　is　used　to　validate　the　model,　which　demonstrates　that　the　model　presented　in　this　paper　ensures　the　system＇s　power　equilibrium　while　considering　the　economic　and　low-carbon　operation　of　the　system　amidst　a　future　scenario　with　a　significant　increase　in　renewable　energy　integration　into　the　grid.　©　2025　IEEE.