In　order　to　solve　the　coordination　problem　of　a　dual-channel　closed-loop　supply　chain　with　a　manufacturer,　a　retailer,　and　a　third-party,　the　dual-channel　closed-loop　supply　chain　model　was　established　based　on　game　theory.　The　optimal　pricing　strategies　and　the　optimal　supply　chain　members＇　profits　of　the　dual-channel　closed-loop　supply　chain　were　studied　under　both　the　decentralized　decision-making　model　and　the　centralized　decision-making　model.　The　results　showed　that　the　system　profit　in　the　decentralized　dual-channel　closed-loop　supply　chain　is　less　than　that　in　the　centralized　dual-channel　closed-loop　supply　chain.　Therefore,　a　modified　two-part　tariff　contract　was　presented　to　coordinate　the　dual-channel　closed-loop　supply　chain.　©　2014　WIT　Press.