Abstract: A ceramic with stable and good performances was synthesized by designing the composition of the CaO-MgO-SiO₂ system with steel slag as one of ceramic raw materials.Its bending strength can reach up to 99.84MPa.The ceramic samples were tested and analyzed by scanning electron microscopy(SEM),electron probe microanalysis(EPMA) and X-ray diffraction analysis(XRD).The results show that when the content of steel slag is 40% the dominated crystal phase in the ceramic is a solid solution of diopside and ferric diopside,but when the content of steel slag is higher than 65% the dominated crystal phases are akermanite and diopside.It is indicated that synthesizing a ceramic with steel slag is a promising technology for the utilization of steel slag with high added values.