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The droughts in Zhejiang Province since 1952 are analyzed by method of colligation drought index and wavelet analysis. There were evident interdecadal variations in droughts in Zhejiang Province. The severe droughts were concentrated around the 1950’s, 1960’s and 2003 to 2004, and often occurred in two successive years. There was a sudden obvious change from drought to wetness in the late 1970’s and a weak climatic fluctuation from wetness to drought in the early 2000’s.