Based on a study of six garnet samples from Archeozoic metamorphic rocks in Inner Mongolia, this paper discusses the relationship of crystal shape, physical properties, chemical composition of garnets and components of the rocks to spectroscopy as well as the formation condition of garnets.The end member components calculated from mineral composition indicate that the garnets in aluminous gneiss consist mainly of Mg-rich almandine, while those in amphibole websterite are composed chiefly of Ca-rich almandine. Chemically, calcium content of garnets is as a rule rather low, controlled by composition of the host rocks. With very few exceptions, the ceil parameter (a0) grows larger with the increasing Ca(2+ ) content.It is considered from an analysis of Mssbaurer spectra that garnets in metamorphic rocks of Jining Group might have mostly been formed under areduction conditions.