This article introduces the composition of ABB AC900F DCS automatic control system of aggregate production line, the construction of trend server of engineer station, the setting of Modbus TCP protocol and Modbus 485 protocol, and the programming of DCS of aggregate production line, etc. The system can directly display the operating situation of the equipment on the operator screen, and improve the operating efficiency of the equipment through data analysis. It can effectively supervise the abnormal operation of the production area and equipment, and automatically alarm and shut down.