Based on the daily meteorological data from 1951 to 2003,the variations of major climate factors that affects Beijing human settlements are analysed.Investigations show that in the last 50 years,the warming trend in Beijing is obvious.Climate warming and the number of extremely hot (cold) days are close correlated,and the overal trend of climate warming resulted in rise in the number of extremely hot days,decline in the number of extremely cold days and rise in the randomicity of extremely hot/cold days,respectively.The heating (cooling) degree days in Beijing dropped (rose) obviously,suggesting that the energy consumption for air conditioners will increase in summer and decrease in winter in Beijing in the future.