Abstract: This paper introduces the research results of ceramic glazes used in industry and human life. The analyses show that the major compositi ons of ceramic glazes are Al2O3, SiO2; a small quantity of K2O, Na2O, CaO, MgO; and a trace amount of TiO2， Fe2O3， S etc. The major minerals a r e quartz， illite, calcite, feldspar, kaolinite, and talc etc. After baking the raw glazes at differnt temperatures, their chemical compositions, mineral phases and valence states of trace impurity elements are changed. This paper discusse s these changes cau sed by baking at different temperatures. The results are significant in improvin g prescription for ceramic gazes, exploring the optimum temperature of baking a nd manufacturing the high quality ceramic products.