Ensuring secure and authorized access to grid services in a dynamic, heterogeneous grid environment is a challenging task. As an important factor in grid security, trust is increasingly applied to management of security, especially in access control. Two major issues that need to be addressed in this regard are: management of trust and an effective access model. In this paper, we propose an access control framework with aware of trust level, which is a value according with trust degree. It can satisfy the requirement in grid service and the simulation verifies its correctness and performance.