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A novel model and architecture of network management-dynamically constructed network management (DCNM) based on the active network technology is proposed. The network services and applications are treated as "soft equipment" managed by the NMS thus all the resources in the network can be managed under this model. As the function of managed objects, i.e., network services and applications etc., management functions will be dynamically constructed along with the development and deployment of variety of services and applications in the network. This makes management itself an adaptive component of the network. The architecture of dynamically constructed network management is composed of the management center, the middle management node, the data collection node, and the management client. A DCNM prototype has been developed based on our research experiences. We use this architecture on management of Web services. It makes management itself a Web service.