This paper discusses the origin of the virus, the virus survival method, mode of transmission, anti - antivirus capability, virus attacks, sabotage and purposes, and against scrapping the Preparatory knowledge and prevention methods. Through in-depth analysis, so network managers clearly understand that the computer systems to the virus have brought tremendous damage and the potential threat! Almost no doubt computer is the most unstable system, in the face of this situation, it can be said that the current fundamental helpless. So in terms of computer users, "keeping oneself clean, disease prevention entrance" is the only way out for the network management staff to make online virus prevention work and responsibility is weightier than Mount Tai