The grid is one of major technologies to transform the vertically integrated silos to horizontally integrated, service oriented systems. Because the grid nodes are heterogeneous and diverse, a 3 dimension architecture of grid information assurance system was proposed to get the information assurance of grid environment. The first dimension consisted of the application layer governed by service manager, the trusted grid infrastructure, the security virtualization, and the trusted resources; the second dimension consisted of trust manager, security policies manager and security monitor among which the policies manager was the core; the third consisted of the services strategy, the services organization, and the services operation. The trust manager, security policies manager and monitor were also designed. Computer simulation showed the proposed architecture works well.
