Abstract:In this paper, the precipitation data at Beijing Observatory from 1841 to 2008, and the rainfall data at 20 meteorological stations and 82 rainfall stations for nearly five decades, are used to analyze the spatial and temporal variations of the precipitation in Beijing at different subregions, and the rainfall data by minute are used by the Generalized Pareto Distribution (GPD) method to analyze the short duration rainfall in Beijing at different return periods. The results have shown that: Beijing has two rainy periods of 1871-1894 and 1947-1960 and two dry periods of 1853-1870 and 1992-present. From the 1970s to 1980s, the heavy rainfall in Beijing mainly occurred in urban area. After the 1990s, the short duration of heavy rainfall displayed the local characteristics of the uneven distribution, and heavy precipitation centers roughly changed to a southwest northeast banded distribution. According to the rainfall spatial distribution and EOF analysis, the rainfall region can be divided into four subregions, i.e. mountain areas, urban centers, northeast mountains and southeast plains. The result of rainfall in different return periods is close to the existing drainage specifications, which means that the simulation results of return period are reliable.