With the rapid development of science and technology, computer network technology has spread to all areas of production and life. However, because of the network has connectivity and openness characteristics, that resulting in network security problems are more prominent, network data theft, hacker attack, viruses, Trojan attacks and other issues direct threat to network information security, economic and social life and even national security have caused a very threat. This paper analysis the computer network security risks existing for the information security threats that facing explore appropriate protective strategy.