中文摘要：

区域降水量是重要的气候变量，研究其对气候变化的影响具有十分重要的意义。利用宜昌地区1960—2006年近50年的汛期和年降水作为观测资料，采用墨西哥帽函数（MHF）作为小波函数，分析了汛期降水和年降水的多时间尺度变化特征。结果表明，在较小时间尺度上，汛期降水与年降水在时域上的分布具有很大的相似性；在较大时间尺度上，年降水的演变略滞后汛期降水。并且推测宜昌地区在未来几年内降水将偏少，这为短期气候的预测提供了一定的参考。

英文摘要：

Regional precipitation is an important climate variable and it is of great significance to study regional climate change. In this paper, wavelet analysis using Mexican hat function （MHF） as a wavelet function is used to analyze the characteristics of the multiple time scale between the precipitation in flood seasons and annual rainfall from 1960 to 2006 in Yichang. Results show that in a smaller time scale, the rainfall in flood seasons is similar to annual rainfall in the temporal distribution; in a larger time scale, annual rainfall evolution lags slightly behind that in flood seasons. Moreover, it is presumed that the annual rainfall in Yichang will be below the average in the next few years, which serves as a reference for a short-term climate forecast.