Hot dry rock resource is a kind of renewable clean energy with huge reserves， the development of hot dry rock needs to inject high-pressure water into deep strata through deep wells， and make it penetrate into the crack of rock stratum and absorb geothermal energy. As the migration channel of fluid， fracture network is very important in the exploitation and utilization of thermal energy in hot dry rock. While the high heterogeneity of reservoir fracture distribution， and the diversity of control and influence factors lead to difficulties on the research work. In this paper， geophysical exploration technology and seismic exploration are used to delineate the target area and drill hole positioning， vertical accurate positioning of fractures during drilling， comprehensive logging to judge the location of thermal reservoir and thermal reservoir quality evaluation； and micro seismic to judge the fracture space distribution during fracturing. The key technologies for accurate identification of fractures in hot dry rock reservoirs are systematically summarized and analyzed， which has guiding significance for improving the exploitation and utilization efficiency of hot dry rock.