Abstract: Cisco’s NetFlow is widely deployed for traffic measurement，since it adopts static sampling rate，while there’s a burst of traffic，it consumes excessive router resources，and even affects the normal forward function.This paper presents a novel flow sampling method based on DCF with controllable resource.It samples a fixed number of packets in the measurement bin，and employs DCF hash algorithm to maintain flow records，which effectively controls resources consumption.Results show that the proposed method can achieve sampling rate’s self-adaptability，simplicity and controllability of resource consumption without sacrificing accuracy.