This paper introduced some books open access cases，analyzed and summarized the policy mechanism that is suitable for the OA of academic books, including several existing open access policies which were mainly for papers such as the feedback mechanism of supervisory + encouragement and punishment, the book-specific on-demand publishing mechanism, the market selection mechanism of books' open publication and the "Delay" mechanism, and the transfer mechanism of subscription funds that is based on the library alliance. It was thought that the policy mechanisms mentioned above can effectively solve the obstacles and promote the progress of books' open access, and can provide some reference for the formulation of books open access policies.