Abstract: Based on the meteorological data of the temperature and precipitation of Guinan station from 1961 to 2007,the climatic changes in Gonghe Basin of Guinan County were analyzed,and their impacts on the grassland degradation were discussed.The result showed that the annual mean temperature increased at the rate of 0.23℃ per decade,which was higher than the national mean.The annual precipitation increased at the rate of 3.0 mm per decade.The annual potential evaportranspiration increased at the rate of 22.23 mm per decade.The days with strong winds and sand storms per year slightly reduced.These changes might be the factors causing grassland degradation in Guinan County.The temperature rising,evaportranspiration increasing,heavier spring drought and less autumn precipitation led to changes of the growing period of the grass and decline of the grassland productivity.

Key words: Climate change, Climate change, Gonghe basin, Grassland degradation