Abstract: Gudao buried hill is a drape anticline with Palaeozoic as its basement, and massive Cambrian - Ordovician carbonate rocks are developed, having the potential of forming fissure karstic geothermal reservoir. In order to evaluate the utilization prospects of the geothermal reservoir and the generating potential,based on the analysis of the geologic background, the authors verified that the Cambrian - Ordovician stratigraphy is predominant by carbonate, taking borehole Gg2 as an example. Badou Formation, Wuyangshan Formation, Beianzhuang Formation of Ordovician, Sanshanzi Formation of Cambrian-Ordovician, and the Zhangxia Formation of Cambrian are mainly composed of limestone and dolomite, which are favorable to develop a fissure karstic geothermal reservoir. The gross thickness of the geothermal reservoir is 480 m. Designating the temperature at the middle point of the reservoir as the average reservoir temperature, aiming at binary geothermal power station as its utilization purpose, and setting the lower temperature limit as 70 ℃, the authors calculated out that geothermal resource contained in the fissure karstic geothermal reservoir is 804×10¹⁶ J at Gudao buried hill. By setting the service lifetime of 30 years, and thermal efficiency of 7%, the generating potential at Gudao buried hill was estimated to be 595 MW, which was classified as a large geothermal field.