Abstract: Based on the data of the surface air temperature,precipitation and sand-dust storm from 1951 to 2006 in Chifeng,the trend of the climate variation in Chifeng during the last 50 years was analysed and the impacts of the climate warming was studied.The result showed that the climate warming had been observed since 1980s in Chifeng.It was the key year of the climate sudden change in 1987.The days with low surface air temperature were obviously less than before.The frostless season prolonged.The accumulated surface air temperature increased.The probability of the extreme weather events,such as the drought or flood and precipitation anomalies increased.The probability of strong wind and sand-dust storm decreased.It was concluded that the impacts of the climate warming on agriculture were more advantageous than disadvantageous,but contrarily on ecological systems.

Key words: Climate warming, Climate warming, Extreme weather events, Impacts on agriculture, Ecological system