The need to monitor the health of the global Internet has now become crucial. In this paper, an object-oriented model for network performance monitoring is dis cussed, which is adopted in the management of China Education & Research Network , a national information network of China. The current state of the network perf ormance management model is discussed first, which is helpful in formulating the setting of goals and requirements which a large-scale performance monitoring m odel must meet. Then an architecture solution to systematize the implementation of Internet monitoring and how it attempts to address these goals and requiremen ts are presented. Finally some examples about how to use this architecture model in real-life network monitoring are given.