The embodiments of the present invention relate to a method for acquiring a PGW FQDN, a home PGW and a system. The method comprises: when a UE accesses a home site from a visited site through a proxy PGW and performs a data service, and after a home PGW receives a session creation request message, returning a session creation response message carrying an FQDN of the home PGW to a visited MME or visited SGSN, the visited MME or visited SGSN storing the FQDN of the home PGW in the session creation response message.