Furong　super-unit　is　a　part　of　Qitianling　granite　mass　which　is　Yanshanian　complex　pluton,　and　is　mainly　composed　of　adamellite　and　moyite.　K2O+Na2O　in　content　ranges　from　7.32%　to　10.01%,　the　average　is　8.17%.　In　the　granitic　classification　diagram　of　K2O-Na2O,　the　most　samples　are　plotted　in　the　area　of　A-type　granite,　but　they　are　characterized　by　high　TiO2,　CaO,　MgO,　and　lower　FeO*/MgO　contrasted　with　the　typical　A-type　granite.　The　REE　distribution　patterns　of　granite　are　similar　to　each　other,　and　show　typical　LREE　enrichment,　an　obvious　negative　Eu　anomaly　pattern.　The　LREE　distribution　curves　are　light　right　deviation　and　the　part　of　HREE　almost　smooth.　For　the　trace　elements　of　granite,　Rb　and　Th　are　enriched　strongly,　Sr　and　Ti　appear　as　strong　depletion,　and　Ba,　Ta,　Nb,　Nd,　Zr　and　Hf　also　show　a　character　of　enrichment　in　a　certain　degree.　Qitianling　granite　with　high　tin　background　content　is　favorable　to　tin　mineralization　in　space　environment　and　time　stage,　showing　a　good　potential　to　tin　mineralization.