On the basis of the existing hydrogeological data in the study area, extraction and recognition of information on natural outcropping points of the karst groundwater system based on ASTER data are carried out. With the ASTER data thermal infrared bands for information source, thermal infrared remote sensing theory and technology are applied, the difference in temperature between the outcropping points of the natural karstic groundwater system and the features of other objects is taken into account. The reparability between them is also explored.