A policy control method for a fixed broadband access network, comprising: setting, in a mobile network to which a user requests to access, a Fixed Mobile Convergence Policy Function, FMC PF, after the FMC PF receives a trigger message from an Evolved Packet Data Gateway, ePDG, requesting, by the FMC PF, a Broadband Policy Control Framework, BPCF, in the fixed broadband access network to establish a policy control session; and performing, by the BPCF, admission control according to Quality of Service, QoS, rules or QoS information transmitted from the FMC PF through the policy control session or delegating another network element of the fixed broadband access network to perform the admission control; the policy control method being characterized in that the trigger message received by the FMC PF from the ePDG is: a gateway control session establishment message carrying Internet Protocol Security, IPSec, external tunnel information or a Dynamic Host Configuration Protocol, DHCP, request message carrying IPSec external tunnel information; that the IPSec external tunnel information comprises a User Equipment, UE, local IP address received by the ePDG; that either the FMC PF is adapted to serve as a function entity separated from a Policy and Charging Rules Function, PCRF, or the FMC PF is integrated in a Policy and Charging Rules Function, PCRF; and that when the user is a non-roaming user, the mobile network to which the user requests to access is the Public Land Mobile Network, PLMN, to which the user belongs; or when the user is a roaming user, the mobile network to which the user requests to access is the PLMN that the user visits, and in that requesting, by the FMC PF, the BPCF to establish a policy control session comprises: determining, by the FMC PF, the BPCF of the fixed broadband access network accessed by the UE or an entry point of the fixed broadband access network according to the UE local IP address in the external tunnel information, and sending, by the FMC PF, an S9* session establishment message to the BPCF, wherein the S9* session establishment message is carried with the IPSec external tunnel information. setting, in a mobile network to which a user requests to access, a Fixed Mobile Convergence Policy Function, FMC PF, after the FMC PF receives a trigger message from an Evolved Packet Data Gateway, ePDG, requesting, by the FMC PF, a Broadband Policy Control Framework, BPCF, in the fixed broadband access network to establish a policy control session; and performing, by the BPCF, admission control according to Quality of Service, QoS, rules or QoS information transmitted from the FMC PF through the policy control session or delegating another network element of the fixed broadband access network to perform the admission control; the policy control method being characterized in that the trigger message received by the FMC PF from the ePDG is: a gateway control session establishment message carrying Internet Protocol Security, IPSec, external tunnel information or a Dynamic Host Configuration Protocol, DHCP, request message carrying IPSec external tunnel information; that the IPSec external tunnel information comprises a User Equipment, UE, local IP address received by the ePDG; that either the FMC PF is adapted to serve as a function entity separated from a Policy and Charging Rules Function, PCRF, or the FMC PF is integrated in a Policy and Charging Rules Function, PCRF; and that when the user is a non-roaming user, the mobile network to which the user requests to access is the Public Land Mobile Network, PLMN, to which the user belongs; or when the user is a roaming user, the mobile network to which the user requests to access is the PLMN that the user visits, and in that requesting, by the FMC PF, the BPCF to establish a policy control session comprises: determining, by the FMC PF, the BPCF of the fixed broadband access network accessed by the UE or an entry point of the fixed broadband access network according to the UE local IP address in the external tunnel information, and sending, by the FMC PF, an S9* session establishment message to the BPCF, wherein the S9* session establishment message is carried with the IPSec external tunnel information.