Hydrotalcite is a kind of layered bimetallic hydroxide with special structure, its adjustable composition and unique structure and performance, it is widely used in the fields of ion exchange, adsorption and separation, catalytic, medicine and so on. In particular, the selectivity, infrared absorption and ion exchange of hydrotalcite-like materials have some special properties, so that as a new type of inorganic functional materials have been applied to PE agricultural film and PVC and other polymer materials, showing a unique performance.