The large-scale tectono-magmatism and mineralization during Mesozoic in eastern North China Craton were resulted from the subduction of paleo-Pacific plate, although the starting time of subduction is still in dispute. In this study, the granitoids from Yaowangmiao-Mopanshan pluton in Xingcheng area, western Liaoning Province were taken for systematic researches, including petrology, Zircon U-Pb dating, geochemistry and Zircon Hf isotopic analysis. Magmatic zircons yield weighted mean ages of 193Ma and 186Ma, so the Yaowangmiao-Mopanshan pluton emplaced during early Jurassic. The granitic rocks are composed of quartz monzonite, granodiorite, monzogranite and syenogranite. All of these rocks have high total alkalis contents and the characteristics of quasi-aluminous to weakly peraluminous, which are belonged to the high-K calc-alkaline series and the geochemical characteristics are similar to the I-type granite. These rocks are enriched in LREE contents and K, Pb and depleted in Nb, Ta, Ti and P. The magmatic zircons of the early Jurassic granitoids have negative εHf(t) (-12.94~-7.39) and ancient tDM2 values (1.69Ga~2.05Ga) which indicates the primary magma was from the partial melting of ancient continental crust and maybe mantle source material was mixed in. The early Jurassic granitic rocks in Xingcheng area, western Liaoning Province have rock assemblages and geochemical characterizes similar to the granitoids formed under the active continental margin related to the subduction of paleo-Pacific plate. The results in this study and regional geological data all indicate that the subduction of paleo-Pacific plate began during Late Triassic-early Jurassic, and the early Jurassic granitic magmatism is response to the subduction of paleo-Pacific plate in eastern North China Craton.