The host rocks of Xiangshan volcanic basin are volcanic-intrusive complex, involves the welded tuff, rhyolite dacite, rhyolite dacite porphyry, porphyroclastic lava, macrophyric granite porphyry and porphyritic granite, constitutes two complete magmatism sub cycle of eruption-overflow(intrusive)-intrusive. The authors use SIMS, LA-ICP-MS technology to analyze the zircon U-Pb geochronology on the main rocks and discuss the origin and evolution characteristics of Xiangshan complex. The results show that, ignimbrite of Daguding Formation represents the early outcome of Xiangshan volcanic intrusive activities, the zircon U-Pb age is 140.7±2.7 Ma, 140.1±1.8 and 138.2±1.6 Ma, U-Pb zircon age of rhyodacite is 135±1.8 Ma. Ignimbrite of Ehuling Formation represents the second begining of the volcanic intrusive activities and the U-Pb age is 135.6±1.2 Ma. Zircon U-Pb age of porphyroclastic pava is 133.6±1.3 Ma. Macrophyric granite porphyry and porphyritic granite are the youngest rocks and the zircon U-Pb age(133.4±1.2 Ma and 133.9±1.1 Ma, respectively)represents the end of the volcanic intrusive activity. From the Early Cretaceous, the duration of the Early Cretaceous volcanic intrusive activity is short, showing a continuous process, with the beginning is about 141 Ma and the end is about 132 Ma. The Xiangshan volcanic intrusive activity takes on two sub cycles. In the first sub cycle(141~135 Ma), the magmatites involve welded tuff, rhyolite dacite and rhyodacite porphyry, while the second sub cycles(135~132 Ma)involve ignimbrite, porphyroclastic lava, macrophyric granite porphyry and porphyritic granite. Rock geochemical and geological features are inconsistent with the evolution sequence.