Technique of periodic analysis is also sugg ested.The prediction of hydrologic time series may be solved satisfactorily by the combination of the two techniques mentioned above.

• 同时针对水文地质时间序列普遍具有周期性特征的事实，提出了用周期分析的方法来修正残差，将二者相结合，可以很好地解决水文时间序列的预报问题。