According to the different initial plant construction conditions such as heat source conditions, raw material properties and land occupation conditions, we can provide a variety of different processes such as one-step method and two-step method, and different types of production lines. The production line equipment adopts the aging cooling process and the modified grinding process, which solves the problem that the phase change of the finished gypsum powder due to the thermal polymerization generated by the residual heat of the grain burning affects the product quality; The problem of poor workability and water retention makes it possible to better apply chemical gypsum to various gypsum building materials.