  With increasing the applications of grid system, the risk in security field
is enhancing too. Recently Trust management system has been recognized as a
noticeable approach in enhancing of security in grid systems. In this article
due to improve the grid security a new trust management system with two levels
is proposed. The benefits of this platform are adding new domain in grid
system, selecting one service provider which has closest adaption with user
requests and using from domains security attribute as an important factor in
computing the trust value.
