中文摘要：

云计算的计费方式是当前云计算中亟待解决的一个关键问题。为了对云计算应用层的计费方式进行更清晰的描述和研究，本文使用一种在变迁上引入成本利润信息的Petri网——成本利润Petri网，对云计算中应用层的计费模式进行了建模设计和分析。针对描述更方便和内容更好表达的问题，提出了成本利润Petri网的概念、定理和使用的算法，并用其构造了云计算应用层的计费模式，从而使云计算的提供商可以对计费模式方式进行更加理性的选择。本文建立了计费分析的参考模型．并用具体实例说明其使用方法的有效性．

英文摘要：

How to charge for cloud computing is an important problem to be solved urgently at present. In order to represent and research the charge model of application layer in cloud computing clearly, the Petri net which introduces the cost and the profit to the transition is proposed. A concept and some theorems of cost-profit Petri net is put forward and used to describe the charge model of the application layer in cloud computing. Thus to the choice to the charge model of the provider of cloud computing, the reference model of analysis has built up. In addition, a specific example is given.