The computer network unusual condition intelligent examination technology is maintains the network health, the security and the stable movement key link, also is at present automatic network management system research hot spot. This article proposed one kind based on the protocol analysis and the probability neural network union network unusual condition examination method. This method first based on the network protocol analysis, carries on the capture and the condition scanning to in the

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... rk movement sensitive data; Then unifies the Bayes smallest risk criterion and based on Parzen window probability neural network PNN, carries on the comparison judgment to the network characteristic data and the network baseline data, thus prompt, accurately examines the unusual condition which the network occurs. This method may discover ahead of time the network potential failure and the danger, help the network management personnel high automation control network according to the anticipated QoS movement.