Abstract: To solve the ever-increasing challenging problem of privacy protection in location-based services(LBS) ,after studying the characteristics of privacy protection in LBS and current methods for privacy protection,a three-dimensional access control matrix model and the corresponding method based on the model for privacy protection are proposed. Then the application of the proposed model and method for privacy protection in LBS are illustrated through an example. Compared to other existing methods for privacy protection,the proposed model and method has the advantage of offering a comprehensive and flexible solution for the protection of user privacy.