The current development status of foam concrete? 1. Achievements of foam concrete? There are many types of foam concrete, but the most commonly used is cement foam concrete. Cement foam concrete can be divided into cement-fly ash-lime type, cement-slag-lime-gypsum type, cement-fly ash-sand-lime type, cement-sand-lime type, cement-sand-lime type, cement foam concrete according to its different admixtures. -Slag-fly ash-lime-plant fiber type [4], cement-sand-glass fiber type and other types. ?Xie Minghui, Cheng Yuemin and others conducted experimental research on cement-fly ash-lime type foam concrete and obtained a density of 691kg/m3, a compressive strength of 3.4MPa, a thermal conductivity of 0.210W/(m·K, It is an ideal foam concrete wall material that can resist 15 freeze-thaw cycles and has a carbonization coefficient of 0.89. Lu Aiping, Guo Yushun and others conducted experimental research on cement-slag-lime-gypsum type foam concrete. The research showed that slag porous concrete can be cured under normal pressure. It is an ideal thermal insulation material (density is 910?kg/m3, ?28d compressive strength is 9.81MPa). It also has obvious advantages in price and has certain market competitiveness. Gao Bo [7] has a certain market competitiveness for cement. Experimental research was conducted on fly ash-sand-lime type foam concrete, and the optimal mix ratio of fly ash 60, lime 5, foaming liquid 3 kg, fine sand 15, and cement 20 was obtained. The corresponding performance is a density of 6kglm3,? The water absorption rate is 229% and the 28d compressive strength is 3.4MPa. Foam concrete is a member of the concrete family. It has low density, light weight, thermal insulation, sound insulation, earthquake resistance and other properties. It is the basic raw material of new foam concrete. It is made of cement, lime, water and foam, and on this basis some fillers, aggregates and admixtures are added. Commonly used fillers and aggregates are: sand, fly ash, ceramsite, gravel chips, expanded polystyrene, Expanded perlite and benzene fine aggregate, the commonly used admixtures are the same as ordinary concrete, such as water reducing agent, waterproofing agent, retardant, setting accelerator, etc. In recent years, both domestic and foreign countries have attached great importance to the research and development of foam concrete. It has been widely used in construction areas, such as retaining walls, construction of sports fields and track and field, sandwich components, composite wall panels, pipeline backfill, lean concrete filling, roof slopes, and storage. However, it has defects such as low strength, cracking, and warm water in its application, and its performance needs to be further improved.