vigorous　development　of　hot　dry　rock　is　helpful　to　the　early　realization　of　＂dual　carbon＂　goal　in　China.　Radiogenic　heat　generation　is　one　of　the　important　factors　for　the　formation　of　hot　dry　rock.　The　study　on　the　geological　characteristics　and　radiogenic　heat　generation　behaviors　of　this　type　of　hot　dry　rock　is　of　great　value　and　practical　significance　in　selecting　the　exploration　target　area　of　this　type　of　hot　dry　rock.　Taking　Lancai　hot　spring　group　area　of　the　Gonghe　Basin　as　the　research　object,　this　paper　studies　the　geothermal　geological　conditions　for　the　formation　of　high-temperature　hot　spring　and　its　radioactivity　characteristics　by　means　of　field　geological　survey,　surface　radioactive　gamma　measurement　and　rock　radioactivity　test.　In　addition,　the　exploration　target　area　of　hot　dry　rock　is　preliminarily　delineated　based　on　geophysical　exploration　interpretation　data.　And　the　following　research　results　are　obtained.　First,　Yanlageng　complex　granite　mass　and　Yangzhihe-Xiaqiong　fault　are　closely　related　to　the　formation　of　Lancai　hot　spring　group　in　the　Lancai　hot　spring　area.　Second,　the　heat　generation　rate　of　outcropped　Middle-Late　Triassic　porphyritic　monzogranite,　moyite　and　porphyraceous　moyite　in　this　area　is　unusually　high,　which　is　5-8　times　that　of　normal　sedimentary　caprock.　Third,　magnetotelluric　sounding　exploration　interpretation　shows　that　the　Yangzhihe-Zhegejiang-Xiaqiong　fault　fracture　zone　is　underlain　by　a　low-resistivity　body,　which　is　inferred　to　be　a　＂body-in-body＂　granite　mass　with　later　intrusion　and　higher　temperature.　In　conclusion,　there　is　Late　Triassic　high-radioactivity　porphyraceous　moyite　mass　with　a　＂body-in-body＂　geological　structure　in　this　area,　which　can　be　used　as　the　main　target　direction　of　hot　dry　rock　exploration.　What＇s　more,　it　is　suggested　to　figure　out　the　spatial　distribution　pattern　of　complex　rock　mass　and　research　the　relationship　between　complex　granite　mass　and　geothermal　fluid　and　its　influence　mechanism　on　the　deep　temperature　field,　so　as　to　provide　an　accurate　basis　for　delineating　the　exploration　target　area　of　hot　dry　rock.　©　2023　Natural　Gas　Industry　Journal　Agency.　All　rights　reserved.