[Objective] To reveal the rules and grade of west Ordos plateau flood disasters in Qing dynasty.[Methods] The method of historical literature analysis and wavelet analysis method were used to research relevant problem.[Results] The study concluded that the western Ordos Plateau flood disasters during the Qing Dynasty happened 89 times and occurred averagely 0.34 times per year. Flood disasters in the western Ordos Plateau during Qing Dynasty could be divided into 5 stages, from 1644 to 1733 was the Ⅰ stage, from 1734 to 1783 was the Ⅱ stage, from 1784 to 1813 was the Ⅲ stage, from 1814 to 1863 was the Ⅳ stage, and from 1864 to 1912 was the Ⅴ stage. The Ⅰ, Ⅲ and Ⅴ stage belonged to low stage, the Ⅱ and Ⅳ stage belonged to high stage. In the area during Qing Dynasty, 89 times flood disaster occurred, and the mild disasters accounted for 24.7%, moderate disasters accounted for 65.2%, severe disasters accounted for 10.1%.[Conclusion] The cycles of flooding disaster occurrences during Qing Dynasty of the Western Ordos Plateau is 65 a, 32 a, 17 a, 10 a and 3 a to 4 a, respectively. The occurrence of floods in this area is mainly due to the increasing annual precipitation and the concentration of annual precipitation. There are 2 humid climate events appeared in the Western Ordos Plateau during the Qing Dynasty, from 1774 to1783 and from 1814 to 1823.