Under computing environment in the global IP network, there come fraud, defamation and conspiracy and other acts. The traditional security means can not respond to such attacks, and resources, the higher the value, the greater the risk. In addition, under the existing distributed environment, there is no centralized authority to obtain all of the interactive information, which results in unreliable and uncertain risks. Trust management to solve this kind of problem recognizes the open system integrity and security information system. Security system decision-making does not require third-party feedback. This resource is the basic object of study, trust evaluation system is established to quantify from the multi-granularity, multi-point security, making the distribution system with the characteristics of trust. And the paper provides a network for a variety of complex IP security decision-making framework for a distributed environment to elaborate new ideas and methods. Finally trust management of existing technology can be able to enhanced and improved, and adapts to the diversity of open IP network security needs.