In order to explore the genesis and dynamic background of the volcanic rocks of the Dianzhong Formation in Shiquanhe area, we present detailed chronological, whole-rock geochemical, and Lu-Hf isotopic geochemistry of volcanic rocks of the Dinzhong Formation, Linzizong Group. The results show that the zircon U-Pb ages of the samples are 57.1±0.8 Ma and 55.8±0.7 Ma, and that the volcanic rocks originally belonging to the Tuocheng Formation, Zenong Group should be reclassified as the Paleocene Dianzhong Formation. The geochemical characteristics show that the samples are peraluminous, high-K calc-alkaline series, with high SiO₂, low TiO₂, low MgO, low Cr, Ni and Mg^_# (mean value 22), enriched in large ion lithophile elements such as K, Rb and Pb, and depleted in high field strength elements such as Nb, Ta, Ti, and P, showing the characteristics of arc magmatism. The fractionation of light and heavy rare earth elements is obvious, relatively enriched in LREE, and the negative anomalies of Eu, Ba, and Sr are significant, indicating the existence of stronger fractional crystallization. The zircon Hf isotope ε_Hf(t) ranges from +2.61 to +9.51, and the T_DMC ^{ages range from} 965 to 514 Ma, indicating remelting of newborn crust materials. Comprehensive analysis suggests that the initial collision of the India-Asia continent collision occurred at 70Ma, after which the New-Tethys slab continued to rollback and was accompanied by the formation of the volcanic rocks of the Dianzhong Formation. At about 56Ma, the slab breakoff induced large-scale volcanism in the Nianbo and Pana Formation, which lasted until about 40Ma.