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Single Sign-on (SSO) based on the Security Assertion Markup Language (SAML) technology is a very important Web security technology, in a flexible and interoperable way to achieve heterogeneous system security. SAML has been the emergence of an effective solution to resolve the shortcomings of traditional Web SSO and become the most popular SSO technology programs. This article which based on an analysis of two typical SAML SSO model proposes a unite-authentication model to direct at their limitations. The model can joint certification spanning a number of SSO authentication-domains. Finally, this paper makes a security analysis for the information in the process of transfer.