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Single Sign-On is one of the more popular enterprise business integrated solution currently. For the complex self-domains across different application requirements, the article researches the traditional single-point sign-on system, and presents a combined access control model. The main form of the model is implemented on Web-service. It extends RBAC access control model, proposes R-R role mapping concept and makes use of extensible policy language SAML and XCAML. At last implement of the application the model is verified on the existing system and we propose the problems to solve next step.