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通过对1954－1987年梅雨区35站梅雨期降水资料的分析，给出了梅雨降水的气候分布特征。利用自然正交函数展开的前三个特征向量场及对应的时间系数将梅雨降水分成三类六型。移动样本序列的极大熵谱分析表明，梅雨降水存在较为明显且稳定的准七年振荡，而准两年振荡则不十分明显，且不稳定。这与已有的研究结果不同。此外，还对这些振荡的地域分布作了研究。
Based on the analysis of precipitation during the Meiyu period in 35 stations in Meiyu district from 1954 to 1987, the climatic distribution of precipitation in the rainy season is given. Using the first three eigenvector fields expanded by natural orthogonal function and the corresponding time coefficients, the precipitation of Meiyu is divided into three types and six types. The maximum entropy spectrum analysis of the moving sample sequence shows that there is a more obvious and stable quasi-seven-year oscillation in the Meiyu precipitation, while the quasi-two-year oscillation is not very obvious and unstable. This is different from the existing research. In addition, the geographical distribution of these oscillations is also studied.