The Miaoling gold deposit is located in the Xiong'ershan-Waifangshan area on the southern margin of the North China Craton. Zircon U-Pb LA-ICP-MS dating of the granite porphyry in the Miaoling gold deposit yielded an age of 157 Ma. Chemically, the granite porphyry is peralumious and characterized by richness of silicon and alkaline, with SiO₂ equal to 75.06%～77.66% and Na₂O+K₂O equal to 7.05%～7.39%, and deficiency of iron, magnesium and calcium. Its REE values are relatively low, being 25.74×10^-6～32.63×10^-6, and display a significant fractionation between LREES and HREES (LREE/HREE=6.74～9.53), with moderate negative anomalies of Eu (δEu=0.51～0.71). The trace elements are characterized by enrichment of large ion lithophile elements (Rb, K, Pb, and Th, U), and depletion of high-field strength elements (Nb, Ta, Ti and Ba, Sr). The whole rock Sr-Nd compositions of the granite porphyry have the data (⁸⁷Sr/⁸⁶Sr)_i=0.706 207～0.711 774 and εNd(t)=-19.0～-17.8, with Nd model ages in the range of 2.39～2.49 Ga. Plotting of lead isotopes of the granite porphyry on the ²⁰⁷Pb/²⁰⁴Pb diagrams and ²⁰⁸Pb/²⁰⁴Pb versus ²⁰⁶Pb/²⁰⁴Pb evolution curves show that the lead might have come from the crust source area. Geochemistry and Sr-Nd-Pb isotopic compositions suggest that the granite porphyry in the Miaoling gold deposit was derived from an ancient continental crust (probably the Archaean Taihua Group).