Abstract: in this study,the spatial and temporal variations of the MODIS Land Surface Temperature (LST) product (MOD11) and average surface temperature in-situ observation data which belongs to 4 weather station was analysed for the whole of LHASA city during the sixth month of 2000-2011.Resultsshowed that LST increases obviously in nearly 12 years,espacially 2009 and 2010,the spatial distribution of high surface temperature concentrated in the center city and the surrounding area,it is going to expand outward as time elapses.the largest high temperature extend presented to june,2007,espacially west area of Namtso and Linzhou district of Lhasa city;in addition,the correlation coefficient are almost accordance between in-situ LST data and LST MODIS inversion data,thus,the MODIS land surface temperature product (MOD11) are suited to monitor large extend surface temperature and Urban Heat Island.