Abstract: Jin-Shaan-Meng adjacent area is a transition zone from semihumid region to semiarid region,and a sensitive region of climate change.Based on reorganizing and analyzing of the historical documents about historical flood disaster in Jin-Shaan-Meng adjacent area, in the light of the methods of least squares and wavelet analysis,spatiotemporel distribution of the frequency,county-times and intensity have been analyzed.The results show that there were 285 years of the historical flood disaster in Jin-Shaan-Meng adjacent area and 835 counties suffered from Han Dynasty to Republic of China.69.2% of the disaster occurrence was in Ming and Qing Dynasties,and 71.3% of counties suffered in Qing and Republic of China. Autumn and summer are seasons when disasters frequently occur.The historical flood disaster presents a rising trend,experiencing three stages,namely gentle fluctuating,rapid fluctuating and rapid increasing.The Tang Dynastiy and Northern Song Dynasty is the first historical flood disaster activities period,and the high frequency periods of historical flood disaster occurred form Ming Dynasty,Qing dynasty and Republic of China is the second historical flood disaster activities period.Wavelet analysis shows that historical flood disaster cycle is 15—18a,26—30a and 3—8a.The spatial distribution the historical flood disaster varies distinctly,and the core has a shift in history period.Of the total disaster-stricken counties,the mild disasters account for 32.58%,moderate disasters account for 53.53%,and severe disasters account for 13.89%.Yulin and Yan'an where there are a large population are the high-frequency disaster center,while Zhum Ge-er Banner and Fangshan counties are the low-frequency disaster center.