The LA-ICP-MS zircon U-Pb ages and Hf isotopic data, major and trace elements and Sr-Nd-Pb isotopic compositions are presented in this paper for the Jiashan syenite intrusive on the northern margin of the North China Craton. The Jiashan syenite intrusive was emplaced at 111～108 Ma in the Early Cretaceous period. The pluton has high SiO₂, K₂O+Na₂O, Al₂O₃, LILEs (Rb, K) and LREE but low Fe₂O₃^T, CaO, TiO₂, MgO and HFSE, with no Nb and Ta anomalies, suggesting intracontinental rift volcanic rocks that belong to the A-type granite. εNd(t) = -5.0～-0.9, t_DM2(Nd)=0.98～1.31 Ga, εHf(t)=-2.7～+4.3, t_DM2(Hf)=0.90～1.33 Ga, Δ8/4=84.9～91.3, Δ7/4=-6.4～-4.0, (²⁰⁶Pb/²⁰⁴Pb)_i=16.63～17.10, (²⁰⁷Pb/²⁰⁴Pb)_i=15.24～15.30, and (²⁰⁸Pb/²⁰⁴Pb)_i=36.54～37.20. According to the comprehensive analysis of the geological field observation, experimental petrology, trace element geochemistry and Sr-Nd-Pb-Hf isotopes, the authors hold that the Jiashan pluton was derived from the mixed source of the lower crust and the depleted mantle, and resulted from the crustal extension and the lithosphere thinning of the NCC. The involvement of the depleted mantle during the formation of the Early Cretaceous Jiashan syenite intrusive indicates the lithospheric thinning on the northern margin of the North China Craton and the upwelling of the asthenosphere mantle, which recorded the magmatic events related to the asthenosphere underplating in a continental extensional environment.