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The supply chain in this paper includes not only the forwards supply chain, but also the reverse supply chain. Studies have shown that an effective management on the reverse supply chain can enhance customers' satisfaction, while increase the profits of corporation. However, the study on the forward supply chain is more and less on the reverse supply chain. This paper mainly creatively proposed a model of reverse supply chain based on generalized stochastic Petri nets from the perspective of business processes in order to choose a more appropriate recycling mode.