Method and system for realizing loosely coupled single sign-on

The present invention relates to a method for realizing single sign loosely coupled, comprising the steps of: first login service server, the service server sends the login information to the single sign-on server, authenticates the user associated with the user to obtain the service server list, generating and storing a steering link, and returns the result of the user's login; log in again when the service server, the service server sends a login link to the steering link generating the single sign-on to the server, and searching for the user the association list and return to the service server, update the service server connection list, and returns the result of user login. The present invention further relates to a system for loose coupling of single sign. Loosely coupled single sign-implemented embodiment of the present invention is a method and system has the following advantages: to reduce the pressure SSOServer, lifting the dependence of SSOServer.