The production technology without water- washing process and instructions of high- strength construction plaster powders made from phosphogpsums for interior- wall were studied in the paper.

Property and structure for gypsum base exterior wall plastering material;

Opening mould in gypsum walling materials molding equipment depended on the artificial experience,generating waste products easily.

Using feasible maintain and drying method can not only increase productivity, but also improve the intensity of the plasterboard.

The numerical simulation was conducted to get the press field ,the velocity field and the density field of the process of extrusion plasterboard.

Surface characters of anhydrite powder modified by titanate coupling agent,effects of the anhydride powder before and after modification on mechanical properties of PVC compounds and the conjoint state of PVC compounds with modified or unmodified anhydrite powder were studied.