Abstract: Based on the statistics and analysis of disasters in historical documents in northern Shaanxi Province during Ming and Qing Dynasties,the temporal-spatial distribution and cause analysis have been analyzed by methods of least squares,wavelet analysis and Kriging method.The results show that there were 645 recorded disasters,and the main disasters were drought disaster,flood disaster,hail disaster and freeze disaster.The mind,moderate and severe disasters accounted for 27.4%,66.4% and 6.2%,respectively.Changes in occurring frequency on the decade intervals show the volatility rising trend and the maximum appeared in the years from 1830 to 1839,and the frequency experienced three stages,namely the lowest frequency,higher frequency,and rapid increase.The disaster occurred mainly in summer and autumn,and often occurred across the season,include summer and autumn,and spring and summer,in relatively high grade.Wavelet analysis shows that historical flood disaster cycle patterns are 2—3 a,5—8 a,10—13 a.The spatial distribution of disaster varied distinctly.Yulin,Suide and Yan-an were the three high-frequency centers,and Huangling and Wuqi were the two low-frequency centers.Different disasters had different spatial distributions.Drought occurred frequently in Mizhi and Suide.Flood,hail and freeze mainly occurred in Yulin,and pest and geological hazard mainly occurred in Huangling.The findings are that there was a close relationship between the disaster frequency and the climate,and the deterioration of the ecological.