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Cloud computing resource is distributed, heterogeneous and indeterminate. For these resources, how to reasonably manage these complicated resources and allocate these resources for users quickly will influence the efficiency of cloud computing. In this paper, we propose a resource allocation method based on multi-unit continuous double auction mechanism and corresponding pricing strategy. Firstly, we create a continuous double auction based resource allocation model which contains three agents. Then we improve the existing double auction pricing algorithm, and introduce new parameters in order to obtain the pricing algorithm that is suitable for cloud environment. In each time period, user agents and cloud node agents determine their bid values and request values respectively. This method can take into account both the requirement of users and cloud nodes, and provide fair chance for the users to achieve resources and the cloud nodes to supply resources.