Abstract: By studying of petrology, petrochemistry and zircon U-Pb isotopic geochronology of the metamorphic rocks in the Shen’ao area, Longhai, Fujian Province, this study discussed the geochronology of source rocks, protolith and dynamic metamorphism and its geological significance. The result shows that the metamorphic rocks can be classified to para-metamorphic rocks, with protolith being pyroclastic to sedimentary rocks. The zircon U-Pb isotopic age dating results are given as follows: 1572±39Ma and 2149±39Ma represent the regional metamorphism age of basement in the Mesoproterozoic and Paleoproterozoic; 248.1±8.1Ma and 250.4±2.4Ma indicate the ages in early-late Triassic; and the ages of 186.4±6.6Ma and 156.7±2.0 Ma represent the formation ages of early Jurassic pyroclastic to sedimentary rocks and peak age for formation of two-mica quartz mylonite or schist resulting from late Jurassic ductile shear deformation, respectively.