1. Light unit weight can reduce the dead weight and cost of buildings, and is conducive to improving the seismic resistance of buildings Generally, the volume weight of aerated concrete is 500-850 kg/m3, while for the volume weight of 450 kg/m3 or more, its weight is only 1/4 of that of clay bricks, and 1/4 of that of ordinary concrete. It is an ideal lightweight material for high-rise buildings, super high-rise buildings and large space structure buildings. With it, the deadweight of buildings can be reduced within 1000 kg/m3. Compared with traditional building materials, The dead weight of the building can be reduced by 3/5-2/3, thus reducing the cost of the building. The light deadweight of buildings can greatly improve the seismic performance of buildings, because the earthquake is the product of the building's mass and the acceleration generated by the earthquake. Obviously, the building with light deadweight has a small mass, and the seismic force is small. 2. With good thermal insulation performance and low thermal conductivity, the thermal conductivity of aerated concrete with unit weight of 400-800kg/m3 is usually between 0.08-0.15 kcal/m * h * degree, which is only 1/4-1/5 of the thermal conductivity of clay bricks and 1/5-1/10 of ordinary cement concrete. In the north, 24cm thick aerated concrete block walls are used. Its thermal insulation effect is equivalent to 49cm thick brick walls. 3 Machinability It is as machinable as wood. It can be sawed, planed, drilled and nailed, which is conducive to construction and can be used on site. 4. The compressive strength of aerated block is strong. According to the experiment, the compressive strength of aerated block is more than 25kg/cm2, which is equivalent to the compressive strength of 125 # clay brick and lime sand brick. 5. When the temperature of aerated block high temperature resistant aerated block concrete is below 600 ℃, its compressive strength slightly increases. When the temperature is about 600 ℃, its compressive strength is close to the compressive strength at room temperature, so the fire resistance of aerated concrete as a building material meets the national first class fire protection standard.