A new method of developing distributed control system（DCS） simulation operation contact interface is proposed based on describing the system structure of the exterior communication interface for the industrial control configuration software. The method uses the graph function of the industrial control configuration software to realize the establishment and operation of the DCS simulation contact interface model. The DCS simulation interface communicates with the dynamic mathematical model of the DCS flow via the dynamic data exchange DDE and the OLE for process control（OPC） interface. Custom-made ActiveX controls enrich the special DCS interface element.