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This article constructed two cloud service trust game models with and without third party certification institutions, set up the cloud service trading mechanism and the trust management mechanism based on the third party certification using game theory, and finally compared the cloud service trust evaluation model with electronic commerce trust system. This article further perfected the credit evaluation methods of existing cloud providers, and provided decision-making information with more trust for cloud users. Through the models and mechanism above, we can draw a conclusion: to found third party certification institutions are an effective measures to control the risk of cloud computing environment. [ABSTRACT FROM AUTHOR]