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Abstract: For the data access in the cloud computing environment, it not only assure the legitimate users can access the data resources quickly, but also assure the access rights of the illegal users are limited, and the threats inside the trust domain are reasonably solved. The security issues have been solved brought by the cloud computing technology. CDSSM model that can effectively implement cross-domain data access is proposed. By setting up the agent, the first cross-domain security identity authentication and repeated cross-domain security authentication are distinguished first, and the cross-domain security identity authentication of data is skillfully optimized. And then the key of the message encryption in the identity authentication was be utilized to encrypts and stores the data block. And finally the security threat in the domain was solved, the security of the user data was ensured. Finally, the CDSSM model has been implemented, and Experiments has shown the key in this scheme can not be forged, replay attacks can be effectively avoided. The efficiency of repeating cross-domain identity authentication is more than 50%, and the read/write performance of files below 100MB is better. It has improved the reliability of data storage and the effectiveness of security certification in the cloud.