Based on collecting,sorting out and analyzing the historical data,we extracted the flood disaster information in the Hexi Corridor during the Qing dynasty and the Republic of China to discuss the climate change characteristics. The results show that 70 times of flood disasters occurred in the Hexi Corridor during the 306 years from the Qing Dynasty to the Republic of China,and flood disaster occurred once every 4.4 years in average. Flood disaster level in the Hexi Corridor was divided into light,moderate,grave and extreme. Their occurrence frequencies were 17%,56%,23% and 4% respectively. The main flood disasters were the moderate one. The occurring frequency of flood disasters was different. The periods of 1645 - 1735, 1780 - 1820 and 1850 - 1880 were the seldom - occurrence stages,and the periods of 1735 - 1780, 1820 - 1850 and 1920 - 1949 were the frequent - occurrence stages. There were seven flood climate events during this periods. From the Qing Dynasty to the Republic of China,floods occurrenc showed an upward trend fluctuation on the whole. Spatially,the flood disasters decreased from the east to the west due to irrational exploitation and the geography reason. This research found that flood disasters in the Hexi Corridor in the Qing dynasty and the Republic of China had inter - decadal oscillations like 20 - 25a,50 - 70a and 130 - 150a. It might be related to the Pacific ten years oscillation and the solar activity cycle.