Internet banking is an extension for the private internet of present banking as well as a supplement for business structure of traditional banking and with the increase of some software as well as hardware instruments, users can connect the banking system with home computers to process some common banking business, which remedies the deficiency of operating branches as well as operating time for traditional banking business. To realize adopting fire wall on network layers which prevent extraneous attack and guarantee the safety for business data transportation on the public internet, integrity identification as well as key management should be simultaneously implemented on the application layers for sensitive data as well as encrypted information. In the context of the safety for internal banking business system as well as the safety for external banking business, this project preceded the internet safety design from the aspects of various banking business, business connection between the head office and branches, OA system and internet banking. In this project, high-quality fire walls are equipped on the panel points of all subsidiary banks of different levels, which guarantee the confidentiality of the IP package. Meanwhile, users’ sensitive information can be protected in business system form illegally distorted, which will achieve the safety functions of encryption as well as identification for business data.