Abstract: At present, too much network bandwidth has been occupied by a variety of P2P applications that greatly affect the backbone of the network. A scheme for data flow optimization is presented to reduce the consumption of the network bandwidth. In the scheme, the peers relationship is divided into physical and logical neighbors, the pathfinder algorithm is used to determine the relationship between peers and achieve topology matching, and the notice/drawback mechanism is introduced in the data scheduling algorithms to make most data transmission under the control of metropolitan area network. The experiment results of a simulation environment prove that the scheme mentioned above is an effect way of reducing the network traffic by 90%.