基于黑河中上游地区水文、气象站的降水观测数据，本文采用相似性搜索方法挖掘相似降水年内分配过程及其地理分区，并在此基础上分析不同区域降水的丰枯遭遇性。结果表明：研究区降水的年内分配过程可分为12种类型，降水的地理分区与祁连山走向基本相同，相同类型具有相似的降水成因。黑河干流水系各降水区域发生丰枯同步现象的频率在39.1%～78.3%之间，不利于黑河分水计划完成的降水发生的频率较高。本文的研究结果可为黑河流域水资源管理提供参考。

Based on precipitation data in the upper and middle Heihe Ｒiver basin during 1990－2012，similar precipitation processes and their geographical distribution are firstly investigated by similarity searching method in this study． And then，synchronous－asynchronous probability of precipitation between different regions are analyzed． There are 12 types of precipitation with similar origin in this study area，and geographic partitioning of them runs roughly northwest－southeast． Frequency of the synchronization precipitation in the Heihe Catchment is between 39．1% ～ 78．3%． The precipitation that is not conducive to completing the planning of water transfer is scheduled to be more frequent． Ｒesults of this study can provide references for the management of water resources in the Heihe Ｒiver Basin．