The present invention provides a method for resource and admission control. In the process of resource requesting: upon receiving a resource initialization request, which is used for requesting a QoS resource for a service, sent by an SCF, a PD-FE of a visited network performing an authorization check and a resource availability check for the resource initialization request, and sending the resource initialization request to a PD-FE of a home network; the PD-FE of the home network performing an authorization check and making an initial policy decision for the resource initialization request, and sending a resource initialization response containing the generated initial policy decision to the PD-FE of the visited network; and the PD-FE of the visited network making a final admission decision for the resource initialization request according to the initial decision policy and the result of the resource availability check. The method provided by the present invention specifies respective functional attributes of the PACF in the home network and of the PACF in the visited network and the interaction process between the two, and solves the problem of resource and admission control supporting roaming.