///This paper presents new geochemical, LA-ICPMS U-Pb zircon dating and LA-MC-ICPMS zircon Hf isotopic results for a biotite plagioclase gneiss from the Taihua Group at the south of Huashan pluton, Shaanxi Province. Geochemical results indicate that the protolith is intermediate-acidic calc-alkaline granitic rock, with low REE content (∑REE=83.13×10-6) and high Pb and LILE element contents (e.g.Rb, Ba). The 176Hf/177Hf ratio of zircons from this sample varies from 0.281 258 to 0.281 404 with obviously negative εHf (t) values (-6.86~-11.23). The Hf model ages vary from 2.96 to 3.24 Ga, indicating that the original magma of the protolith derived from Mesoarchean crust.