Abstract: In order to ensure efficient and fast access such distributed data，the grid system adopts data replication.However,when the space is limited，the fiels have the lowest value must be replaced.The paper proposes the file replacement strategy for grid cache based on economic model，fully used the way which in the economic auctioned to cause auctioneer’s income to be biggest.The results simulated with Optorsim show that the proposed strategy results in a notable improvement over traditional replication strategies in a grid environment.

Key words: grid, replica, cache, auction, economic model

摘要： 网格系统中，采用复制策略来保证有效快速地读取大量分布的数据。然而每个节点提供存储副本的空间是有限的，当空间不够时就要用替换策略把价值最低的替换出去。提出了一种基于经济模型的替换策略，充分利用了经济学中拍卖的方式来使拍卖人的收益最大。用Optorsim模拟实验结果表明在网格环境下，与其他传统的替换策略相比可以有效地提高系统的性能。

关键词: 网格, 副本, cache, 拍卖, 经济模型