A　kind　of　glass　ceramics　of　the　CaO-MgO-Al2O3-SiO2　system　was　successfully　synthesized　by　using　goldmine　tailings　as　raw　materials.　Differential　thermal　analysis　(DTA)　was　used　to　determine　the　nucleation　and　crystallization　temperatures.　X-ray　diffraction　(XRD)　and　scanning　electron　microscopy　(SEM)　were　used　to　determine　the　crystal　structure　and　microscopic　structure.　It　was　found　that　the　kind,　microstructures　and　distribution　of　crystalline　phases　in　glass-ceramics　can　be　controlled　by　alerting　the　nucleation　agents.　Needle-like　or　column　diopside　microcrystals　with　the　size　of　2-5　μm　were　formed　when　3%　Cr2O3　was　added,　while　round　diopside　with　size　of　0.2-0.4　μm　presented　as　main　crystal　and　Ca-Fe　diopside　grains　as　sub-main　phase　when　2%　Cr2O3　and　2%　TiO2　composites　were　both　existed.