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In the trusted testing of cloud platforms,isolation testing of virtual networks is one of the important tasks.The traditional isolation detection method only extracts network con_guration information from the database and reconstructs the network structure.However,these data do not necessarily reect the current status of the virtual network and may a_ect the test results.To solve the above problems,this paper proposes a multi-layer virtual network isolation detection method based on trusted third party for distributed cloud platform environment.Firstly,The basic idea of the method is to extract the correct test input data from the database and each agent node,and then compare these data with the reference value,and then conduct a multi-layer evaluation of the isolation of the virtual network based on the comparison result.Then,a formal method is used to verify the e_ectiveness of the proposed scheme in detecting network isolation under both the policy updating and post-update scenarios.Finally,build a simulation experiment environment based on CloudSim4.0 to evaluate the performance of the multi-layer detection method,including the comparison with the traditional detection methods,and test the performance overhead of the test method on the test-end system.The experimental results show that the multi-layer detection method has less impact on the test-end systems performance,and as the test scale increases,the gap with the traditional programs overhead will gradually decrease.