The　Reshuiquan　hot　dry　rock　(HDR)　in　the　Guide　County,　with　an　area　of　approximately　122　km2,　is　characterized　chiefly　by　semi-elliptical　shape　and　lies　in　the　west　of　the　Reguang　fault　which　is　part　of　Xinjie　fault　zone　with　NNW　trend.　The　ZR1　well　reflects　that　the　upper　part　of　the　Reshuiquan　HDR　is　a　medium-temperature　hydrothermal　system　with　self-enclosed　capping　properties.　A　relatively　complete　or　impermeable　sub-high　temperature　granite　body　is　observed　from　2800m　to　3050m.　The　temperature　of　the　stratum　at　3050.68m　is　151.34,　indicates　that　a　HDR　layer　is　developed.　This　HDR　reservoir　is　mainly　composed　of　middle-late　Triassic　granite　whose　time　intruded　into　the　stratum　is　233.2~222.3Ma.　The　rock　types　of　the　granite　can　be　subdivided　into　diorite,　granodiorite,　monzonitic　granite　and　K-feldspar　granite.　The　Xinjie-Waliguan　strike　slip　and　extrusion　structural　zone,　marked　by　a　regular　flower　structure,　is　a　regional　heat　conduction　channel　and　controls　the　regional　distribution　for　the　HDR.　Comprehensive　analysis　on　the　magnetotelluric　sounding,　high-resolution　gravity　anomaly,　linear　inversion　of　resistivity　and　phase　velocity　of　Rayleigh　wave　group,　and　geology　show　that　the　heat　source　mechanism　of　the　Reshuiquan　HDR　is　most　probable　a　compound　heat　source.　These　partial　melting　layers　within　the　continental　crust　are　the　most　important　heat　sources　for　this　HDR.　Furthermore,　a　superposition　heat　source　for　this　HDR　comes　from　the　mantle　heat　flux,　small　melting　body　rising　along　the　strike-slip　fault　zone　during　the　late　period,　and　decay　of　radioactive　elements　such　as　U,　Th,　and　K　within　the　double　crust.　©　2020,　Science　Press.　All　right　reserved.