The Introduction Of Production Process The crusher break the bigger gypsum stones to about 25mm smaller ones. Then the smaller ones will grinded by the grinder. After chosen by the screening machine the gypsum powder that meet the degree of fineness will be calcined in the hot oil calcinator and the gypsum powder that can’t meet it will be returned to the grinder and regrind. The qualified gypsum powder will sent to the warehouse or to the board production line. Process Flow Diagram All the equipments mentioned above are adopted the PLC control system. It can control the speed, temperature, mumidity and the running situation at any time. Its with high degree of automation and easy to control. So we need less workers and decrease the cost and increase the efficiency. It is the commen equipment for the morden construction industry.