The existing edge routers can not assign the link capacities between User datagram protocol(UDP) subscribers and Transmission control protocol(TCP) subscribers to ensure the multiple priorities traffics with Differentiate-Serve(Diff Serv). To solve the problem,a new Diff Serv edge router with Controlled-UDP(C-UDP)is proposed. The proposed Diff Serv edge router can control the data rates of UDP and TCP subscribers according to their priorities. In the proposed edge router, there are multi-queues buffers controlled by TCP Active queue management(AQM) and UDP AQM algorithms to implement fair and stable link capacities. The proposed TCP AQM and UDP AQM algorithms achieve the network congestion control and Diff Serv by operating AQM parameters on the stable conditions proposed by us. The dynamic simulation results demonstrate the proposed edge router for Diff Serv network to be valid. The existing edge routers can not assign the link between users datagram protocol (UDP) subscribers and Transmission control protocol (TCP) subscribers to ensure the multiple priorities with Differentiate-Serve (Diff Serv). To solve the problem, a new Diff Serv edge router with Controlled-UDP (C-UDP) is proposed. The proposed Diff Serv edge router can control the data rates of UDP and TCP subscribers according to their priorities. In the proposed edge router, there are multi-queues buffers controlled by TCP The proposed TCP AQM and UDP AQM algorithms achieve the network congestion control and Diff Serv by operating AQM parameters on the stable conditions proposed by us. The dynamic simulation results demonstrate the proposed edge router for Diff Serv network to be valid.