Abstract: To protect the privacy of users in a network environment,this paper discusses the main characteristics of privacy protection,proposes a user-centric access control model that allows the user to control access to their private information,and finally illustrates the process of applying the proposed access control model through an example.Compared with other models and methods for privacy protection,this model can provide better privacy protection without much additional burden to the users.Additionally,the mechanisms proposed for privacy protection will not adversely affect the usage of other security mechanisms in the same systems and networks.