本論文建置三個雙銷售通道、單一回收通道及三個雙銷售雙回收通道的閉鎖式供應鏈，探討在不同的模型下會如何影響供應鏈的成員的決策。透過數學模型的建置，尋找供應鏈成員們的最大化利潤及決策變數的關係。本篇論文與文獻中最大的不同在於：在供應鏈中，我們採用的模型是雙銷售通道在單一回收通道與雙銷售通道在雙回收通道。我們假設在不同的階層採用Stackelberg Game方法，在相同階層採用Nash Game方法。最後給予結論以及未來可能的研究方向。

In this paper, we have three dual-channel closed-loop supply chain (CLSC) models with a single channel to collect used products and three dual-channel closed-loop supply chain models with dual channel and dual channels to collect used products. We develop the mathematical model to find the maximal profit of all the members who closed-loop supply chain and how to affect the channel decisions. Different of literature：In the supply chain, we have two situations in the dual selling channel. One is a single channel to collect used products and the other is the dual channel to collect used products. We consider using Stackelberg game model in different echelons, and using Nash game in same echelons. Finally, we give conclusion and future research.

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