黑河流域是我国西北地区第二大内陆流域，中游地区，地势平缓，水源充足，并建有多座水库，西部粮食和蔬菜生产基地之一。在气候变化的背景下，该流域的降水格局发生了一定程度的变化。本文以黑河流域及周边地区15个气象站点的1961年－2010年的逐日降水资料和国家1:25万的DEM资料为基础，分析了黑河流域平原地区和山丘地区的降水变化特征。结果表明：（1）平原地区降水较少而山区降水相对较多，整体呈降水增加趋势且山区所占比例较大；（2）山区和平原地区的降水质心均向西南偏移，且山区偏移明显；（3）全流域上分布较广的0～100 mm降水带在萎缩，相反分布稀少300 mm以上降水带在增加。

The Heihe River Basin is the second largest inland river basin in northwestern China, and its middle reach area has gentle terrain slope and abundant water resources for the operation of reservoirs. Moreover, the river basin is one of the grain and vegetable production bases in western China. Under climate change, the rainfall pattern changed to some extent in the river basin. In this paper, the daily precipitation data of 15 meteorological sites in the Heihe River Basin and the surrounding area from 1960 to 2010 and the national 1:250,000 DEM data were used to analyze the variation characteristics of precipitation in the plain and hilly area of Heihe River Basin. The results showed that (1) there is less precipitation in the plain region but more in the mountain area, and the overall precipitation has increased with most of which occurs in the mountain area; (2) the precipitation centroids of the mountain and plain area move to the southwest and it is more obvious in the mountainous area; and (3) the wide distribution of 0-100 mm precipitation decreases while the less distribution of 300 mm precipitation increases.

国家重点基础研究发展计划（973计划）项目（2010CB951102）；“十二五”国家科技支撑计划项目（2012BAC19B03）；国家自然科学基金创新研究群体基金项目（51021066）；河北省自然科学基金项目（E2012402067）