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Anti-virus Scanning is one of the key technologies in today's network security field. Multi-pattern matching algorithm plays an important role in the anti-virus applications. This paper analyzed some commonly used pattern matching algorithm. On the basis of AC-BNFA algorithm, this paper proposed an algorithm handling viruses with more than one signatures quickly. Experiments show that this algorithm is much faster than both exsited automaton-based algorithms and BM algorithm without consuming much memory.