Abstract: A high-strength foaming material was prepared by using perlite as raw material and NaOH as the activator at certain temperature treatment. The effects of alkali concentration, roasting temperature, heating rate and holding time on the apparent density, thermal conductivity and compressive strength of samples were investigated by single factor method. The microstructure and morphology of samples were characterized by SEM and XRD. Results showed the optimum properties of the sample can be obtained when the concentration of NaOH was 12 mol/L, the calcination temperature was 450℃, the heating rate was 3℃/min and the holding time was 3 h. The apparent density, coefficient of thermal conductivity and the compressive strength of the sample were 0.476 g/cm³, 0.062 W/(m·K) and 6.321 MPa, respectively.