以某地区1984~2003年逐月的参考作物腾发量(ET0)为基本资料,首先对ET0时间序列进行了Dmey小波消噪和距平处理,然后采用Morlet复小波对其进行多时间尺度分析,显示了ET0在各个时间尺度下的演变特征.结果表明,ET0具有120月、55月、40月和16月左右的主要周期变化,这4种主要周期变化主导了ET0在整个时域上的波动变化特性;并且自2003年后期以来,ET0变化的大趋势是从低于平均水平逐渐增大并会持续若干月. Based on the monthly ET-ET (ET0) from 1984 to 2003 in a certain area, Dmey wavelet denoising and anomaly processing were first performed on ET0 time series, and then multi-time scale analysis was conducted using Morlet complex wavelet , Shows the evolvement characteristics of ET0 under various time scales.The results show that ET0 has the main periodic changes of 120, 55, 40 and 16 months, and these four main periodic changes dominate the ET0 in the whole time domain Volatility characteristics; and since late 2003, the trend of ET0 changes from below average to gradually increase and will continue for several months.