Along with the development of the Internet, computer network has penetrated into all aspects and sectors of the society and the department. The computer network has already become an important infrastructure both in the society and schools. Social relying more on computer network makes the reliability of the network system itself more important. At present, as the network applies more and more widely, the development scale of the computer network expands and the management of network system is becoming more and more complex, the network brings people convenience and network fault and unsafe factors also brings a lot of trouble at the same time. Therefore, it's necessary to monitor the management of network running, detect malicious attacks and unsafe factors on the network in time, and take actions to keep the network stable and reliable.