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．