Autoclaved Aerated Concrete (AAC) block and board have become the pillar industry in construction field.The aerated concrete (i.e. aeroconcrete) is characterized by the advantages of light weight, heat preservation, sound isolation, high strength，processable property and so on, what's more, the raw materials of AAC are abundant. Especially, it can not only make use of industrial waste residue, improve environmental pollution, and protect tillable field, but also create favorable social and economic benefits to take fly ash as the raw material of AACblock and board. Aerated concrete (i.e. aeroconcrete) is the perfect wall material to replace the traditional solid clay brick. For many years, Aerated Concrete (AAC) has always accepted strong supports from the policies about reforming of wall material, tax policies and environment protection policies. Aeroconcrete (AAC) block and board have become the important part of new-type construction materials, and possess bright development future.