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As the flooding of malicious codes such as worms, how to analyze large number of malicious samples quickly and effectively becomes a great issue for researchers in network security. This paper proposed an analysis algorithm for worm network behavior based on event sequence, which uses the data flow recombination and compression methods to process the pure malicious data. With this algorithm, one can quickly extract the network behavior profile and the signature of the worm. The application of this algorithm will greatly improve the efficiency of analyzing the worm network behavior, which will be significant for the deployment of firewalls and network invasion detection systems.