水文时间序列往往在时域中存在多层次时间尺度结构和局部化特征。运用小波分析的多分辨率功能，对宜昌水文站1882-2006年年径流量时间序列资料进行了多时间尺度分析。研究结果表明：宜昌水文站年径流量存在明显的年际变化特征，主要存在30～40年、10～20年及10年以下3类尺度的周期变化规律，变化主周期为14年，第二周期为7年，第三周期为34年；自2006年以后的3年左右，宜昌站年径流量将处于一个相对偏枯期，之后又将进入一个丰水期。

 Hydrological time series usually in time domain have multiple time scales structures and localization features. In this paper, the wavelet multiple time scales analysis method was used to analyze annual runoff time series from 1882 to 2006 of Yichang Hydrological Station. Research results show that the annual runoff time series of Yichang Hydrological Station has obvious annual change features, and mainly has change cycles of 30-40 yr, 10-20 yr and below 10 yr. The first change cycle is 14 yr, the second cycle is 7 yr. Runoff trend analysis shows that the annual runoff will be in a relative dry period in about 3 years since 2006, and then, a relative wet period.