We analyzed the annual and interannual variability of runoff discharge and the related influential factors in Urumqi River basin during the hydrological years from 1957 to 2009 using linear analysis,Mann-Kendall test,correlation and grey correlation analysis methods based on the annual runoff,temperature,and precipitation data from the hydrological station located at the river outlet.Results showed that:(1)annual runoff had the increasing trend during the study period,and the annual average temperature increased significantly while the annual precipitation decreased slightly;the runoff had relatively greater value and was sufficient during the period from 1991 to 2000,and had average value during the hydrological years from 1957 to 1990 and from 2001 to 2009;in terms of seasonal distribution,the runoff in Urumqi River basin mainly concentrated in summer and fall seasons while runoff was relatively small in winter and spring;the runoff was the greatest in June,July and August within a year;(2)Mann-Kendall analysis showed that the annual,spring and winter runoff had significant increasing trend while the increasing trend for runoff in summer and fall seasons was insignificant;(3)the correlation and gray correlation analysis showed that the increased runoff in Urumqi River basin was mainly caused by precipitation during the study period.