The metabasites in the Archean Yishu}i complex of Shandong province wvere dated for the first time by the Sm-Nd whole rock isochron method at 2997 Ma, which confirms the existence of Middle Archean granulite facies supercrust rocks in the Tancheng-Lujiang fault of Central Shandong. The Yishui complex coasists mainly of two-pyroxene plagioclase granulite, two- pyroxene plagioclase gneiss, two-pyroxene itabirite(small amounts)，two-pyro- xene amphibolite and charnockite. They make up the oldest massif in Shan- dong-the Gongdanshan massif, which corresponds approximately to the Jiaadong Group in age but might be somewhat lower in horizon. The Yishui complex has been subjected to high amphibolrte facies to granulate facies metamorphism, and the protolith of metabasites is something like K-depleted tholeiite whose REE patterns are of flat type and LREE-enriched type with εNd(t) being +3.8 ±0.3.The materials came from the depleted (upper) mantle, which is lithologically very similar to some granulate facies rocks in the northern margin of the North. China platform, suggesting the similarity of their provenances in chemical characteristics. Nevertheless, their major REE patterns are somewhat different from each other, indicating the geochemical inhomogeneity of Archean rocks in different areas.