Based on analyzing the requirement of network bandwidth management function and the procedure of data processing, in this paper, the network diffluent management system, which has the function of application priority management, is developed on the basis of network data processing stages. This system can resolve the problem that the non-critical business data seizes much of network bandwidth resource that should be used by the critical data. As a result, it optimizes effectively network bandwidth resource configuration and improves the quality of services and the management capacity of network.