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Cloud computing is a rising IT industry. How to charge for cloud computing is an important problem to be solved urgently at present. By analyzing and sorting, this article designs a charging model based on infrastructure layer in cloud computing called the infrastructure cloud. This article also proposes a Petri net which introduces costs and profits. A problem that attracts common concern in industrial circles. Based on the cost-profit Petri net, this article contributes to modeling design and analysis about charging model in cloud computing infrastructure layer.