Building gypsum (natural gypsum or chemistry by-product gypsum was calcined) is the main raw material of gypsum block. Firstly, adding water to the raw material, mixing and shaping it, finally drying. Then we can obtain the blocky and lightweight wall material—gypsum block. The main characters are: light weight, tidy appearance, smooth surface, fire prevention, heat insulation, sound proof and so on. The other advantages of gypsum block are: high intensity, not easy to be aging, easy to be processed, can be sawn and other decoration characters. Especially the gypsum block can be used as the decoration material for the interior war.