Satellite data in different resolutions were used to study thermal environment characters of water body type,Miyun Reservoir, typical urban water bodies and their impacts on the environment around Beijing.The research of different land-use types using MODIS land surface temperature product indicated that at average seasonal time scale water body type of Beijing had temperature-decreasing effect during the daytime,while it had temperature-increasing effect in the night,of autumn and winter,and had temperature-decreasing effect in the night of spring and summer.The analysis of Miyun reservoir using NOAA/AVHRR data showed that it had cold lake effect in the daytime and warm lake effect in the night in summer.On no-freezing condition in winter, Miyun Reservoir had warm lake effect during the day and night.But on freezing condition it had cold lake effect during the day and had no warm or cold island effect during the night.The monitoring results of typical urban water bodies in Beijing using FY-3A/ MERSI,NOAA/AVHRR and Landsat-TM data indicated that water bodies of urban had no heat island effect and the larger area water bodies had strong cold island effect.The analysis of land surface temperature of buildings within 500 meters to typical urban water bodies and Temple of Heaven Park,respectively,indicated that water bodies had lower temperature than the green space of Temple of Heaven Park.Average ground surface temperature of buildings decrease by 1.2,0.6 and 0.4℃ with the distance away from water bodies less than 100 m,100-200 m and 200-300 m,respectively.Green space of Temple of Heaven Park had cooling effect only within 100 m distance with the surface temperature decreased by 0.4℃.The results showed that satellite data could be effectively used to monitor thermal environment of these water bodies,and large area of water bodies were important sources of slowing down urban heat island effect.The maximum distance of cooling effect of water bodies on building around was 300 m in the urban areas of Beijing.