The computer network technology is developing rapidly, and the development of Internet technology is more quickly, in this case, people more aware of the importance of network security. Due to the information system in the application of the need for security protection, therefore, the study of computer network security problems are always revolve around the information system. Nowadays, the global computer network security companies and scientific research departments are trying to study and solve the problem of network security, not only developed a variety of maintenance network security hardware and software products, and launched a variety of security of network communication standards and specifications. This article is from the network between the transport layer and application layer, designed a network security system based on Web, and implements a truly safe Internet network.