Urban　carbon　emission　is　one　of　the　hotspots　of　global　change　research.　The　interactive　relationships　among　the　carbon　emissions　of　various　sectors　within　the　social-economic　system　are　often　overlooked.　The　goal　of　this　research　is　to　take　Northeast　Industrial　District　(NID)　including　Liaoning,　Jilin　and　Heilongjiang　provinces　as　a　special　case　study　to　explore　the　impact　of　different　emission　sources　on　the　internal　interaction　of　carbon　emission　system.　To　do　so,　a　carbon　emission　interactive　network　(CEIN)　model　is　developed　to　demonstrate　the　interactions　of　embodied　carbon　emissions　within　the　system　using　factorial　analysis　and　input　output　analysis.　The　control　situation　and　mutual　interactions　between　sectors　within　the　system　of　NID　were　examined,　and　the　impacts　of　different　emission　sources　on　the　internal　interaction　of　carbon　emission　system　were　discussed.　Moreover,　the　utility　indicators　were　revised　to　distinguish　the　impact　of　system　boundaries　on　changes　in　system　ecological　relationships　and　evaluate　the　comprehensive　properties　of　the　system.　It　is　found　that　the　indirect　emissions　of　NID　were　huge.　Liaoning　Province　had　the　largest　total　emissions　during　the　study　period,　with　indirect　emissions　accounting　for　more　than　60%　of　the　total　emissions.　The　pulling　weights　of　the　agricultural　sector　in　three　provinces　of　the　system　were　significantly　insufficient,　with　all　weights　less　than　3%.　The　driving　weights　of　the　agricultural,　mining　and　primary　manufacture　sectors　in　three　provinces　were　insufficient,　while　the　driving　weight　of　the　advanced　manufacture　sector　was　excessively　strong.　The　most　important　transmission　department　did　not　have　the　most　important　effect　on　the　network　mutualism.　The　definition　of　system　boundary　had　a　huge　impact　on　the　accounting　of　system　emissions.　The　results　will　provide　a　scientific　basis　for　guiding　the　reform　of　the　carbon　emission　system　and　achieving　regional　coordinated　development.