Over the past 50 years, temperature in the Northwest China p resented a significant rising trend, while p recip itation change was different in different p lace. Warming and drying trend is evident in the whole Northwest China, but the local appearswarming and wetting phenomenon. With the global warming, glaciers retreat and snow line rises, permafrost melts, wetlands degradation, lakes shrink, river flows decrease, water resource becomes scarcer, and eco - environmental degradation. According to IPCC forecast results, the climate warming trend in this region in the future will be more p ronounced. The countermeasures to p rotect the ecological environment, imp rove the comp rehensive climate change monitoring system, launch specific research on the key regional climate changep rocesses, and other suggestionswere put forward.

on the daily average temperature of 150 weather stations in northwest China from 1961 to 2003, the characteristics ofthe < 0 ℃ , > 0 ℃ and > 10 ℃accumulated temperature in response to climate change have been analyzed by using climatic tenden2cy coefficient and climatic tendency quotiety. The interannual change of < 0 ℃ , > 0 ℃ and > 10 ℃ accumulated temperature have been analyzed based on the time coefficient from EOF bymeans ofwavelet analysis andMann Kendallmethod. The results show that < 0 ℃, > 0 ℃ and > 10 ℃ accumulated temperature p resented increasing trend in Northwestern China, and the mean climatic tend2
ency quotieties of < 0 ℃ negative accumulated temperature, > 0 ℃ and > 10 ℃accumulated temperature are 52. 9 ℃/10 a, 50. 7℃/10 a, 49. 3 ℃/10 a,respectively.

A study was carried out about the duration time，scop e，and intension of the 2002 summer and autumn continuous drought  in Cransu，which long duration time and heavy intension scarcely appeared in recent 50 years. The causes of continuous drought were ainly depended on that Westerly circumfluence，and the High ridge over Baikal and Northwestern Pacific very strong ;the trough ver Southern Indian Peninsula weak; the sea levelpressure departure on the high side;sea surface temperature anomaly and El Nino ccurring. All those above together forced into continuous drought in Cransu Province.  These results were significantly to establish the reventing and reducing calamities rules and valuably to short一term climate forecast.