This article aims to analyze the change of dry-wet condition surface and its cycles in Ankang of Shaanxi Province from 1959 to 2013,to provide reference for understanding the regional response and mechanism to the global climate changes and the improvement of the agricultural ecologic environment. The daily data of Ankang from 1959 to 2013 were collected to analyze the temporal change of the dry-wet condition by using the methods of humidity index,Morlet complex wavelet and Mann-Kendall test and so on. The results showed that,the surface humidity index of Ankang is slightly increasing in fluctuation and the rate of the change of which is 0.07 /10a; spring and summer have relative humid climate in recent 55 years,but there are obvious aridity trend in the spring and obvious humidity trend in the summer; there exists periodic oscillation with multiple time scales of annual and seasonal humidity index in Ankang,in which the first major annual cycle are 28a,and seasonal cycles are 17a,28a,16a, 21a,for spring,summer,autumn and winter,respectively; there are obvious abrupt changes of surface humidity index in the past 55 years in Ankang.