Abstract: Taking the 120 t test ladle with composite reflective insulation plate of Masteel as the research object, the steady heat transfer model of the ladle was established. The temperature distribution of the test ladle and ordinary ladle lining was calculated, and the heat transfer behavior of the composite reflective insulation plate ladle was compared and analyzed, and its process effect was predicted. Combined with production test, the process effect of composite reflective insulation plate ladle in the refining and continuous casting process was analyzed and verified. The results show that the composite reflective insulation board has good thermal insulation performance, which can effectively reduce the heat transfer of molten steel from the ladle lining to the outside in the production process. The average temperature of the ladle shell reduces 39.43 ℃, and the heat transfer reduces 813 MJ. During refining, the temperature rise rate of LF for SPHC, Q235B and SPA-H steel increases about 0.60 ℃/min, the refining power consumption reduces 2.98-3.67 kWh/t, and the temperature drop rate of molten steel reduces 0.18-0.20 ℃/min. During continuous casting, the molten steel temperature in the tundish steadily increases 3.45-5.96 ℃, and the qualified rate of tundish temperature increases from 85.50% to 98.20%.