This paper analyzed the hydrological characteristics and change trend in the basins of Urumqi, Manas and Kuitun of the northTianshan during the last 50 years. Long time series data from the hydrometry stations of the river outlets were used for analysis with certainhydrologic statistical models. The results indicate that the runoff of the rivers have strong similarity in their hydrological characteristics.The distribution of the annual runoff is highly imbalanced between the four seasons, and concentrates in summer. The concentration degreeof the runoff is comparatively high in all the three rivers. The value of Cv is relatively small during the whole study period, but increasinggradually. Significant increase occurred in Cv value after the 1990s. The runoff changes also show an overall increasing trend, and it is veryobvious after 1990s.