Lu-Hf isotopic compositions of zircons separated from the garnet quartzite (M08), staurolite-bearing garnet-biotite-quartz schist (D242-Y2) of the Mengjiatun formation complex and biotite plagioclase gneiss (M03) of the TTG gneisses at Mengjiatun village, Xintai City, western Shandong Province, have been analyzed through the La-MC-ICP-MS method. All the rocks mentioned above were formed 2.7 Ga ago. Combining with the regional geology information, the authors deduce that the 2. 7 Ga magmatism is an important magmatic tectonothermal event in the western Shandong Province area, even in the North China Craton. Many zircons in the metasedimentary rocks show the tendency that the metamorphic overgrowing rims have lower 176Lu/177Hf but higher 176Hf/177Hf values than that of the magmatic cores, demonstrating the substantial influence of the metamorphic garnet on the Lu-Hf isotopic system of zircons.