By using maximum temperature

minimum temperature and mean temperature

sunshine duration

evaporation

precipitation

relative humidity

and average wind speed of 5 weather stations in Irtysh river valley in Xinjiang from 1961 to 2013

the spatial and temporal trends of the temperature in this region were studied through taking the method of climate trending rate

5 years running mean tread and Inverse distance weighted interpolation method. The main results were as followed: Diurnal temperature range (DTR) generally showed a reducing trend at scales of the year and decade

and except Altay City

the reduction trends of the rest regions in Irtysh river valley were all significant. Variation trends of DTR in each season were inconsistent

but generally showed reducing trend. Maximum and minimum values of annual DTR assumed reducing trend. Annual maximum and minimum temperature assumed increasing trend. Rapid increasing of minimum temperature and slow rising of maximum temperature were the direct causes of DTR decreasing. The average annual DTR was positively correlated with average temperature and average wind speed

and negatively correlated with sunshine duration

precipitation and relative humidity. Main factors affected the valley DTR were the average temperature

precipitation and average wind speed

and the strongest correlation factor was the average temperature

followed by precipitation. Main influence factor affected DTR varied from each station.