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Cloud computing is an emerging commercial calculation mode. The flexibility, reliability and low cost make cloud computing gradually be widely used. The government cloud is a kind of private cloud based on cloud computing which can optimize the government's systems, improve government's work efficiency and also service quality. The index management system's function includes assessment, analysis and evaluation of index operations. As a service mode of both large amount of storage and computation, the index management system needs to meet the requirement of data security and data sharing. These needs can be met well in a way based on cloud computing.