Abstract: The foaming cement was prepared with the main materials of Zr-contained silica residue as admixture, the ordinary Portland cement as the cementing material, the hydrogen peroxide as the foaming agent. The optimal calcination temperature and the dosage of Zr-contained silica residue were obtained through the cement mortar experiment and cement paste fluidity. Meanwhile, the properties and pore structure of foamed cement of Zr-contained silica residue were studied. The results showed that, the optimal calcining temperature and the appropriate dosage of Zr-contained silica residue were 450°C and 5% respectively. When the dosage of hydrogen peroxide was 3.6%, the density of the sample is 450kg/m3, 7d of the compressive strength is 3.6MPa, 28d of the compressive strength is 4.2MPa, and thermal conductivity is 0.0903W/(m·K), which could meet the requirements of superior products level of the standard of autoclaved aerated concrete block.