By analyzing precipitation data from 1951 to 2018 at 86 meteorological stations in Guangdong Province， it is found that the precipitation slightly increases overall， with an annual period， and the increasing rates are different from year to year and from region to region， for example， the increasing rate of annual precipitation in central cities is 1.6 times of that of the whole province. Objective function values of Nash-Sutcliffe efficiency coefficient of Pearson-Ⅲ distribution and normal distribution are 0.965 and 0.845 respectively for its geographical distribution， 0.357 and 0.670 for its yearly temporal distribution， and 0.582 and 0.547 for decadal temporal distribution， implying that the annual precipitation in Guangdong is featured more geographically than temporally. The

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values of the geographical， yearly， and decadal temporal distributions are 0.111， 1.643， and 0.138， respectively， indicating that the seasonal precipitation varies significantly， despite similar duration length （i.e.， 6-month rainy and 6-month dry seasons each year） it has a large peak-to-valley ratio which is far more than the ratios of spatial and temporal distributions. According to the area-cumulation of annual precipitation， regional rainfall patterns in Guangdong correspond to the three step-topography： 1） Plain to mid-hilly regions including the east coast， west coast， Pearl River Delta， and Qingyuan county are areas rich in rainfall； 2） The transitional regions from mid-hilly to northern mountain areas， and their two wing extensions are areas with medium rainfall； 3） Leeward regions of eastern， western and northern mountain areas and Leizhou Peninsula are areas poor of rainfall. In particular， there is a belt from the east Leizhou Peninsula to the western mountains， then to the front of northern mountains， and the eastern front of Wuyi mountains in Guangdong， forming a transitional zone separating areas of rich in rainfall and poor in rainfall， where annual precipitation is related logarithmically to ground elevations.