The metamafic rocks especially the mafic granulites in the Yishui complex are companioned with the charnockites closely, and they appear as layers or with different size in the charnockites. Petrology, geochemistry and SHRIMP zircon UPb dating of the metamafic rocks are researched in this paper. They can be divided into three kinds of rocks on their petrological characters. They are high amphibolite faces metamorphosed (hypersthene bearing) plagioamphibolites (andesite), granulite faces metamorphosed garnet bearing hornblende twopyroxene plagioclase granulites (ultramafic basalts) and spinel and garnet bearing hornblende twopyroxene granulites (basaltic komatiite?). On REE distribution diagrams of (hypersthene bearing) plagioclase amphibolites, LREE are enriched obviously. And on diagram of trace elements, largeion lithophile elements including Sr, K, Rb, Ba and Th are enriched while high field strength elements such as Nb, Ta, Zr and Hf are depleted. Contrastively, the granulitefaces metamorphosed samples have flat REE distribution models with the ratios to MORB of the most elements approximately equal to 1 except slightly enrichment of K, Rb and Ba. On lithology distinguishing figures, most of the samples are sited in the area of calcalkaline basalts and some samples are sited in the area of MORBs and islandarc tholeiites with low potassium. On tectonic setting distinguishing diagrams of rocks, samples are mainly sited in area of volcanic arc basalts. Dating research of these samples indicates that the SHRIMP zircon UPb ages can be divided into the following four groups: 2719Ma may represent the lower limit of the first granulite faces metamorphic ages and the 2560~2607Ma may represent the upper limit of it, whereas, 2509~2522Ma indicates another high amphibolite—granulite faces regional metamorphism occurred after the intrusion of the Yishui Complex. The youngest ages are 2485Ma and 2497Ma that represent the ages of metamorphism and zircons related to fluid activities. The age of primary rock is still uncertain and need to be further studied.