Based on the hourly temperature data from 43 automatic weather stations in the January and July of 2004,the main distribution features of urban heat island(UHI) in the Beijing region are analyzed.The results show that the UHI mean intensity was stronger in nighttime(winter) than daytime(summer);the UHI exhibited a spatial structure of multiple centers and the maximum value center shifted from one place to another with in a day both in summer and winter,but the diurnal range of HUI intensity was larger in winter than summer;and the HUI in Beijing also displayed a temporal structure of multi-time scales,i.e.diurnal(20—30 h) and weekly(120—270 h) peorids dominate whether in winter or summer with the weekly peak on Wednesday to Friday and the weekly trough on Saturday to Monday,and the range of oscillations was more remarkable in winter than summer.