It is difficult to distinguish the reliabilities of different resources in the grid environment. For the first time the signaling game theory is applied to the research on grid resource reliability in the paper. A grid resource transaction model based on compensation is proposed and the solution is presented. Theoretical analyses and simulation results show that the resource provider should abandon the cheating motivation voluntarily. The resource demander could make right decision without other nodes’ recommendations, so the calculating and communicating spending is reduced remarkably. This is a new solution to the problem of distinguishing resources’ reliabilities in the grid environment.