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Grid applications must provide exceptional quality of service but because of the complexity and diversity of grid environment, the quality of service (QoS) can not be guaranteed. In order to solve the problem of quality of service in grid, QoS mechanisms must be introduced, that is, the QoS parameters of the problem description. At present, there are a lot of QoS researches, but very little research related to quantitative QoS, and even fewer with the principles of economics to analyze the problem. In this paper, a QoS-based banking model grid is introduced to make use of the hierarchical idea, logic resources QoS, system QoS, security QoS, trust QoS in each level, analyzing QoS attributes and proposing measurement of the five categories of QoS. Finally, according to the measurement results, Service Level Agreement (SLA) is added so that the SLA becomes the basis for exchanges between the parties. In this way, it can be widely used in evaluation, selection and optimization on grid QoS control strategy.