Abstract:In order to protect enterprise secrets, it is necessary to adopt a safe, effective and mature technology to ensure the security of enterprise information. The security equipment, such as the network gate, is the basic data security exchange platform for internal and external network, through network isolation, security access control, protocol stripping, recombination and other technologies to realize controllable and secure data exchange, a set of perfect data security exchange system for internal and external network is established. This article refer to the power grid enterprise security protection standards, the public security information communication network boundary access platform security standards and other industries both inside and outside network security protection design, combined with the application requirements of power grid enterprises, proposes a multi-level security isolation protection, security strategy for strengthening management and control of data exchange, It also designs an internal and external network data security exchange platform, data exchange system and security management control method that meets the needs of power grid enterprises, and realizes security data exchange between internal and external network of power grid enterprises. At the same time, the application effect of the system in the actual environment of the internal and external network of the power grid enterprises is expounded in combination with the pilot, the promotion and the practice.