Abstract: Using blast furnace slag as main raw material，NaOH as an activator，hydrogen peroxide as a pore-forming agent，and CaCO3 whisker as a modified material，a new inorganic thermal product was prepared.The influence of CaCO3 whisker dosages on physical properties of the ma-terial was discussed.The test results showed that with the quality of blasé furnace slag as a base mark，the prepared materials with thermal conductivity coefficient of 0.081 W/m·K，compressive strength of 1.15 MPa and bulk density at 0.52 g/m3 were obtained under conditions of NaOH 6%，H2O2 2%，water-solid ratio 0.5 g/mL with the addition of CaCO3 whisker 3% (curing for 28 d).

Key words: Blast furnace slag, CaCO3 whisker, Thermal insulation material, Thermal conductivity coefficient, Bulk density, Compressive strength