关键词: 降水日数, 降水强度, M-K突变检验, 小波分析, 空间插值, 海河流域

Abstract: Based on daily precipitation data from 30 meteorological stations in Haihe River Basin（HRB）from 1960 to 2013，the spatial and temporal variation of precipitation days and intensity with different grades was analyzed by using methods of linear trend，five years moving trend，Mann Kendall，Morlet wavelet and IDW.The results showed that heavy rain intensity in the southeast was larger than that in the northwest，and heavy rain days in the southeast was more than that in the northwest，while light rain showed opposite variation trend in HRB.The days of rainstorm and heavy rainstorm decreased from southeast to northwest.Light rain was the main form of precipitation in HRB，the linear decrease trend of light rain days was very significant（P<0.01），the linear increase trend of intensity was very significant（P<0.01），and the linear trend of rain day and intensity for other grades was not significant.Mann Kendall test showed that light rain days decreased abruptly，the intensity of light rain had occurred an obvious transition，but no mutation occurred.The days and intensity for heavy rain showed no obvious mutation.The main cycles of precipitation days with different grades had quasi periods of 10 and 17 years，and those of precipitation intensity with different grades had quasiperiods of 17 years.The results could provide the basis for agriculture structure adjustment and sustainable agriculture development.

Key words: Days of precipitation, Intensity of precipitation, M-K test, Wavelets analysis, Spatial interpolation, Haihe River Basin