The invention discloses a strategy control method and a system, and is used for solving the technical problems of establishing a strategic conversation, establishing a dynamic strategy for a fixed network and finally realizing the management of the resources of a mobile network and the fixed network. The invention has the technical scheme that: when user equipment (UE) is connected into the fixed network, a strategy executing entity and a band-pass crystal filter (BPCF) establish the strategic conversation of the fixed network for the UE; when the UE is attached on an evolved packet system (EPS), a packet data network gateway (P-GW) and a policy and charging control function (PCRF) establish an Internet protocol-connectivity access network (IP-CAN) conversion for the UE; the establishment of the IP-CAN conversation triggers the PCRF and the BPCF to establish a communication strategic conversion for the UE; and the BPCF links the strategic conversation of the fixed asset and the communication strategic conversation, and the BPCF obtains relevant strategies of the UE from the PCRF through the communication strategic conversation.