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Cloud computing environment is a new IT service model to support large-scale computing resources of virtualization, on-demand computing, dynamic deployment and flexible scalability. Cloud computing architecture has fore levels. First level is SaaS (Software as Service). The following layer is PaaS (Platform as a service). The third layer is IaaS (Infrastructure as a service). The bottom layer is IT infrastructure (IT Foundation). Cloud computing has dynamic, flexible, elastic, on-demand computing features. It makes particularly suitable for complex and volatile economic environment.