Annual precipitation pulse is one of the principal factors in climatic change research. It is not only an important indicator of that, but also a dominant factor for vegetation production prediction. In order to realize the recognition of the annual precipitation pulse characteristics, the research focused on the Morlet wavelet analysis method to analyze the temporal and spatial change based on eighteen meteorological station data during past decades in Kerqin sandy land region. The results showed that the annual precipitation were 337.476 mm, 369.273.2 mm, 422.668.8 mm and 483.497.1 mm in Ⅰ, Ⅱ, Ⅲ and Ⅳ sub-area during study period, respectively. The characteristics were gradually decreased from the southeast (Ⅳ sub-area) to the northwest (Ⅰ sub-area) in spatial scale and the complexity enhanced in temporal scale. On the aspects of interdecadal mean precipitation, the I sub-area had the maximum percentage as 12.95% when the precipitation increased and the minimum percentage as -19.26% when the precipitation decreased. In addition, the Morlet wavelet analysis showed that there were double significant milt-temporal changing periods of 5~11 years and 23~32 years, and oscillation period was weak gradually in the above mentioned spatial scale and the periodic duration was gradually decreased simultaneously. However, the periodic intensity was more in 23~32 years than in 5~11 years and the most modulus value emerged in 26~32 years among 23~32 period, which indicated the precipitation periodic changed most significantly in this period. There were rest temporal scale periods too, but had less periodic change. Due to sub-area's wavelet variance results, we also indicated that Ⅰ, Ⅱ and Ⅲ sub-area had same dominant period at 10~11 year cycle and Ⅳ sub-area emerged at 25 years. So, it could be concluded that the regional precipitation fluctuation characteristics had same regime when annual precipitation is less than 450 mm and the regime was significantly different when the annual precipitation is more than 450 mm. According to the period oscillation change trait of the annual precipitation, we also predicted that the precipitation could be less than normal from 2016 to 2020 in Kerqin sandy land region.