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The emerging cloud computing is developing into a new enable technology for service integration, making essential conditions for the appearance of public clouds, which integrate external services and provide services to third-party users. In contrary with traditional application integration, the service integrated in public clouds has to deal with a larger scale user accesses and monitor the execution of external atom services, it is necessary for Integrated Cloud Service Vendors (ICSV) to consider deployment architecture to ensure a high quality of service on user end. To solve such issues, this paper designs and proposes a deployment framework for public clouds, which constitutes business process model, cluster distribution model and node deployment model. These models are constructed to figure out and solve the deployment issues in different perspectives and become a system solution as a whole. The proposed framework aims to conduct ICSV to rationally deploy public cloud clusters, avoid potential congestion caused by single-point communication and provide reliable public cloud service to end users.