Zircon in-situ Lu-Hf isotopic analysis of the Mesozoic magmatic rocks in Zijinshan area was carried out by using the laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to reveal their protolith origin. The results show that Middle-Late Jurassic and Early Cretaceous magmatic rocks have different Hf isotopic compositions, suggesting that they originated from different sources. The Middle-Late Jurassic granites exhibit obviously negative εHf(t) values from -13.5 to -2.9, with the peak values of two-stage model ages (t_DM^C) ranging from 1.7 to 2.0 Ga, indicating that the magma was mainly sourced from the partial melting of Paleoproterozoic basement. The Early Cretaceous intrusive-volcanic rocks include Sifang granodiorite, Zijinshan, Yueyang and Wenwu volcanic rocks. The Sifang granodiorite and Zijinshan volcanic rocks have similar zircon Hf isotopic compositions, with a wide range of εHf(t) values (-2.3～0.4 and -8.9～5.6) and two-stage model ages (1.3～1.4 Ga and 1.1～1.5 Ga), suggesting that they originated from the same source, with the mixing of partial melting of the Mesoproterozoic basement and mantle-derived melts. The negative εHf(t) values from -2.7 to -9.6 and two-stage model ages ranging from 1.4 to 1.7 Ga of Yueyang and Wenwu volcanic rocks indicate that they were derived from partial melting of the Meso-Paleoproterozoic basement with minor mantle components. It is held that the Early Cretaceous intrusive-volcanic rocks of Zijinshan area were derived from the same magma source, and the evolution of magma source with continuous variation of components and compositional content reveals a complex crust-mantle interaction. Therefore, the difference of Hf isotopic compositions between the Middle-Late Jurassic and Early Cretaceous magmatic rocks could be attributed to different magma sources, and these rocks were produced at different stages of the paleo-Pacific Plate subduction beneath the Eurasian continent.