中文摘要：

区域降水量不但是影响土壤风蚀的一个重要因素，同时还对植被及农牧业发展起着决定性的作用。以内蒙古寒旱区降水量为研究对象，在收集多年气象站观测数据的基础上，引入MHF小波函数，对其时间序列进行小波分析。揭示了区域降水量变化的多时间尺度的复杂结构，分析了其在不同时间尺度下的周期性和突变诊断点。研究表明：内蒙古寒旱区降水具有明显的季节性和阶段性特征，以1年和9年的周期振动最强；在整个时间域上，降水量呈减小趋势。

英文摘要：

The study focused on the precipitation time series of past long years in dry - cold areas, Inner Mongolia, China, which is one of important factors influencing on wind erosion, vegetations, agricultural development. The MHF wavelet method was adopted to analyze the temporal - frequency multi - time scale variations and jumpfeatures of dust storm activities, which can reveal the multi - scale characteristics of dust storm. Gonsequently, the periods and turning points of precipitation in different time - scale were revealed. Meanwhile, the trend of rainfall in the following years was forecasted. The results showed that the precipitation showed obvious staggeredfeatures in dry - cold areas, Inner Mongolia, China. It was also found that approximate 1 - year and 9 - year pe- riod- oscillation was the strongest. In final the wavelet coefficients patterns exhibited a probablely decreasing trend in the following years.