Abstract: As the quantity and category of the network service explosively grow, the problem of network service management is getting more prominent. The research of this paper focuses on network service management which is above network layer. The hierarchical network service fault management system based on correlation graph and case base is designed and implemented. The architecture design and several efficient ways to get fault information are concretely introduced. A selfadjusting threshold algorithm is proposed. After that, the primary event correlation and network fault diagnosis are analyzed briefly. Finally, the concrete architecture and each functional modules are realized.

Key words: network, service, fault management, diagnosis, threshold