Urumqi City and Changji Hui national autonomous prefecture (Urumqi-Changji region) is located in the northern slope of the Tianshan Mountains and southern edge of the Junggar Basin of Xinjiang. The precipitation is extremely less and evaporation is high over this region. Dry climate and water shortage are the major factors restricting local socio-economic development, especially agricultural production and environmental protection. To investigate characteristics of dry-wet climate change in the past 49 year...