In terms of Landsat TM thermal infrared band data,the land surface temperature was calculated with the mono-window algorithm.Then the spatial distribution of the land surface temperature was investigated for heat island effect.The results showed that densely populated urban heat island effect was noticeable in Nanjing with surface temperature about 10 ℃ higher than that of water and forestland area.And that actual surface temperature was closely related to surface emissivity which showed surface overlay typ...