2010年7月17日至18日,安康市紫阳、岚皋、汉滨等县区出现了有水文观测记录以来强降水,坝河、黄洋河、任河分别出现了1000年、500年、50年一遇洪水,安康水文站出现建站以来第第三场大洪水(21700m3/s)。本文分析了安康“7.18”暴雨、洪水特点,初步揭示了安康“7.18”大洪水形成的原因。 From July 17 to July 18, 2010, heavy rainfall occurred in Ziyang, Langao and Hanbin counties in Ankang City, with heavy rainfalls occurring in hydrological observation records. The occurrence of heavy rainfalls occurred in 1000, 500, and 50 years in the dam, Huangyang and Renhe, respectively In case of flood, the third largest flood (21700m3 / s) since the establishment of the Ankang Hydrological Station appeared. This paper analyzes the characteristics of heavy rain and flood of Ankang “7.18 ” and reveals the reasons for the formation of Ankang “7.18 ” flood.