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.

The previous atmospheric Circulation adjustment and development,strong frost and freeze injury Climate background, weather CharacteristiC，west wind inDex、hanged T213 objective forecast of the rare event OCurged on May 3一5 in 2004 in Cansu provence were analyzed in the paper and it will have some certain directive signific;anc;e for frost predic;tion} disaster prevention and fin fiber in the future.

Based on the historical material of T106 model and observed data of stations, we obtain the predictor after handling the da-
ta, and build the MOS prediction equations about the temperature, wind, cloud and precipitation of 80 stations in Gansu Province.
After the operational application, we get the better prediction results, and supply an objective tool for weatherman.