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The arid central Asia (ACA), climatically controlled by westerly circulation, is one of the areas significantly influenced by global change.Based on the latest 1901-2006 average monthly precipitation data of 0.5°×0.5° grid point provided by Climatic Research Unit (CRU), we have analyzed the temporal characteristics and spatial variations of precipitation in ACA over the past century.The results indicate that annual precipitation during the past century increased slightly over the whole area.And the spring precipitation, which has the most contribution (32.37%) to annual precipitation, shows the highest increasing rate (0.7mm/10a).