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In this paper, the rough set approach is applied to water resources allocation in the inland river basin of arid region. A decision table of the water resources allocation in the inland river basin of arid regions is established by the real situations of the basin. Then, an optimized allocation scheduling is gained by the attribute reduction and the core computation for the decision table. As a test, an example is studied. The exemplary computation showed that not only the results are rational, but the methods are also more useful in practices. Meanwhile, the problem of allocation imbalance of water resources of the classical methods in the region studied is solved. Therefore, it provides a more reasonable and powerful method for the government management branches.