This study optimizes the multi-pattern matching algorithm for the intrusion detection system in the computer network, so that the system can be in operation in the high-speed environment. First, we comprehensively analyze the algorithm and principle for network intrusion detection. Second, we elaborate the idea of optimizing the multi-pattern matching algorithm for its implementation, so that the algorithm efficiency is increased and then the detection system is improved. In summary, the optimized algorithm can enhance the network detection system.