The rare metal rubidium is rich in Nouthern area of Liaoning Fuxin. The plutonic rock related to Rb mineralization is mainly medium—fine -grained monzogranite.This paper aims to solve the age, geochemical characteristics, tectonic environment of granite and its relationship with rubidium mineralization. Methods:We performed the zircon SHRIMP U -Pb isotopic dating,in situ micro -area Lu—Hf isotope test,the major elements、trace elements compositions of the Early Jurassic granite in Nouthern area of Liaoning Fuxin.Results:The crystallization age of the fine -grained monzogranite granite is 175.6±2.8Ma,which belongs to peak period of the Early Jurassic magmatic activity. The plutonic rock is alkali rich, peraluminous, high degree of differentiation. Enrichment HREE,Th,U,Hf, loss Sr,P,Ti. The plutonic rock contain low content of K/Rb (70.92~82.93) 、Strong negative Eu anomaly(δEu=0.20~0.40)、total rare earth elements(ΣREE=56.35~122.23) and the ratio of LREE/ HREE(LREE/ HREE =3.10~4.73), Nb/Ta(Nb/Ta =7.90~10.18) Lower than the upper crust (Nb/Ta =13.4).The zircon εHf（t）values of TC1301RZ1 are between 3.5~8.8，TDM2 are between 659 Ma and 992 Ma。Conclusions:The Rb—(Y+Nb) and Rb/10—Hf—3Ta graphic reflects that the tectonic environment for the formation of the rock mass is intra -plate environment.Study on rare metal rubidium in combination region,it is considered that the Early Jurassic fine -grained monzogranite in this area is one of the important prospecting indicators for rare metal rubidium deposits.