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Cloud storage service brings about not only low cost and scalability, but also great challenges in the field of data security and privacy protection. Security has been regarded as one of the greatest problems in the field of cloud storage service. Aiming at the present problem, a trusted control model of cloud storage (TCMCS) is presented. With the using of cipher-text access control and integrity verification, TCMCS makes the users' data safe. Considering the security and efficiency in data sharing, we introduced the trusted third party (TTP). Theoretic analysis and simulation show that data security can be preserved while retaining prefect performance in data processing.