Abstract: The Mesozoic intermediate-acidic granitic complexes exposed in eastern Jiaodong area, the eastern part of Shandong Peninsula, contain abundant inclusion of fine-grained diorite. The Synthetical study on field geology, petrology, geochemistry and isotopic geology of the complexes and their inclusions suggests that they were syngenetic mantle-derived and crust-derived magmas formed by layering melting and then mixed together, During fractional crystallization, the migma produced the intermediate-acidic granitic complexes of different styles.