As a demonstration from the two rivers of the Ebinur lake basin,the paper checked the periodic characteristics and change trend of annual runoff processes and annual precipitation from 1961 to 2008 by using the Mann-Kendall test,line analyze and the wavelet analysis method.The main conclusions were as follows:(1)The trend of precipitation was increasing in Boertala river and Jinghe river of Ebinur lake basin during the 48 years.The average trends of Boertala station was 8.54 mm/10 a and the average trends o...