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We face increasing uncertainty, cheat and risk when executing Grid resource trades, which is taken as a prominent feature of the market-oriented Grid. As participants of Grid, we cope with these complexities and uncertainties by relying trust for lacking of enforceable and globally uniform laws for Grid. So we propose a Grid resource trade model based on evaluation of trust to assist Grid participants to avoid cheating. The model allows Grid resource consumers (GRCs) to dynamically pay Grid resource providers (GRPs) for resource use of each step by dividing one trade into many steps, that is, "pay as you use". Theoretical analysis and simulations prove that our proposed model can tackle Grid resource trades in a secure and effective way.