The embodiment of the invention provides a achieving method and system for a strategy control, and a strategy and charging implementing entity, and a strategy and charging functional entity, which can solve the problem of not processing the strategy control for the applying service under the situation of no AF. The method comprises: the strategy and charging functional entity receives the information of the emergency incidents sent by the strategy and charging implementing entity; the strategy and charging functional entity generates the control strategy of the service stream according to theapplying incidents and issues the control strategy for the strategy and charging implementing entity. The embodiment of the invention sends the obtained applying incident information to the PCRF via the PCEF. Under the situation of no AF, the PCRF can generate the control strategy according to the context of the applying incident information and the other strategies, so that the invention guarantees the QoS of the service stream, and processes the effective strategy control of the charging and the gate control; thereby the invention processes the strategy control for the data under the situation of no AF.