It is significant and necessary to estimate regional evapotranspiration(ET) distribution in the hydrology and water resource research. The study focused on analyzing the surface evapotranspiration of Chungcheongbuk-do using Landsat 7 ETM imagery. For this process, the LANDSAT ETM+ on May 8, 2000. From this data. The estimation of surface evapotranspiration is based on the relationship between Temperature and Vegetation Dryness Index(TVDI) and Mortion's actual ET. TVDI is the relational expression between Normalized Difference of Vegetation Index(NDVI) and Land Surface Temperature(LST). The distribution of NDVI corresponds well with that of land cover/land use in Chungbuk. The LST of several part of city in Chungbuk is higher in comparison with the averaged LST. And TVDI corresponds too well with that of land cover/land use in Chungbuk. The low evapotranspiration availability is distinguished over the large city like Cheongju-si, Chungju-si and the difference of evapotranspiration availability on forest and paddy is high evapotranspiration.