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Grid architecture for computational economy (GRACE) is widely used in grid. But it has been discovered that the module of pricing fluctuation is not explicit. Fixed prices of resources would cause the problem whereby the recourses customers would get recourses at a higher price and the resources provider would lose benefit in grid. This paper presents a new kind of pricing fluctuation control model called resources pricing fluctuation control based on belief function (RPBF), as a part of GRACE architecture. The detailed inner architecture is also presented. At the end, simulating experiments prove the RPBF can help most resources customer and resources provider to trade at the ruler of balance of interests.