Abstract:The spatial temporal distribution characteristics of precipita tion in the flood season (from May to September) of past 45 years in Huangshan are analyzed with spectral analysis, continuous wavelet transformation and empirical orthogo nal function (EOF) decomposition techniques. The results indicated that there ar e obvious drought/flood cycle about 3- to 4- year and 16- to 20- year in Huang shan as a whole, while there is drought/flood cycle about 10 year in its northwester n region. At present, Huangshan is in the third drought period during the past 45 years. By the first space mode decomposed with EOF, it is found that the spatial distribution of precipitation has close relationship with the orientation of Hu angshan mountain. The spatial anomaly of precipitation can be divided into three patterns, i.e., the mid west type, south type and northeast type.