RCS is an interoperable standard for IMS communication services, which was developed by GSMA. Presence and authorization are important parts of the RCS program. According to the requirement of presence and authorization, as well as referring to IETF, OMA, GSMA standards, this paper proposes an implementation project for RCS privacy, which includes a framework and a SIP signaling sequences. This paper mainly discusses the key technologies used in the implementation process of RCS privacy, which includes the processing strategy of presence, signaling sequences of subscription, and the processing strategy of authorization documents. The experimental result shows that this project has implemented functions, which are required by RCS privacy.