Abstract
According to the precipitation data of Shandong Province, the trend of precipitation change in Shandong Province was firstly analyzed through the climate trend rate, and then the abrupt change point of precipitation was detected by the Mann-Kendall test, sliding t test and other methods, and the periodic features were extracted by wavelet analysis. The spatial characteristics of precipitation are analyzed by kriging interpolation method in ArcGIS. The results showed that the interannual precipitation in Shandong Province decreased in summer and autumn, and increased slightly in spring and winter. Through multiple methods, we have identified the interannual, seasonal abrupt points. Then, we found the first, second and third periods of interannual precipitation. In terms of space, the annual precipitation gradually decreases from the southeast coast to the northwest inland; the annual precipitation in each region of Shandong Province is basically reduced to a different extent, and the southeast coastal region has a larger reduction than the northwest inland region.
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