Abstract: The pattern matching is one kind of network data package of parsing technique in the information filtration system which is based on the attack characteristic,matching algorithms performance immediately influence to the efficiency of the overall system,which is a main bottleneck in the current information filtration and observation system.so taking BM algorithm whose speed is quite quick as the foundation an improved algorithm is proposed,using the pattern matching defeat\'s information,causes to jump over the great distance as far as possible in each caper. Had proven through the experiment the improvement algorithm reduced the match number of times and had a higher efficiency.Key words: information filtration;BM algorithm; improved algorithm; pattern match
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