Abstract: Facing ever expanding of the Internet and the increasing number of applications on the network, the traditional network management is not able to satisfy the new demands on managing changing networks and applications. A new network management model——dynamically constructed network management was therefore proposed. In dynamically constructed network management system, the expansion of managed objects is an important component. A method for visualized expansion of managed objects was proposed. The visualization was achieved by generating a managed objects sets (MOS) tree on the manager interactive interface, and a set of graphical editing tools was supplied to help devices manufacturesand application developers to define their MOS modules visually. The generated MOS modules are of valid syntax format, and were submitted to the network management system. They are ready to be loaded into the management system by the dynamic MOS compiler. Then the association and expansion between managed objects and management functions were implemented through accessing those modules.