Based on meteorological and hydrological data of Xinqushou hydrological station in Gurt River in 1974 —2014

the cumulative trend

mutation characteristics and cycle variation of meteorological and hydrological factors were analyzed by cumulative anomaly method

Mann-Kendall mutation test and wavelet analysis. Meanwhile

the relationship between the meteorological hydrological factors of the Gurt River and Kuitun River and Ebinur Lake was analyzed. The results showed that: (1) In the last 40 years

the temperature

precipitation and runoff showed a trend of decreasing first and then rising

and the inter-annual variability was 7.95%

15.84% and 6.68%

respectively; (2) Sudden changes occurred in the late 1980s

and the abrupt precipitation change time was earlier than the temperature (the early 1980s)

and the runoff mutation time was at latest (the end of the 1990s); (3) Meteorological and hydrological factors showed a variety of different periods of oscillation cycle

while the most common interdecadal change cycle of temperature

precipitation and runoff was 25～28 years

17～22 years

4～6 years

respectively; (4) Runoff had a good correlation with air temperature

and its relationship with precipitation was complicated; (5) The trend of the runoff in Kuitun River was basically positive correlated with the Gurt River

and the main driving factor of the deterioration of the ecological environment in Ebinur Lake in the early 1970s was the overdevelopment by mankind.