Abstract: The old dust-removal equipment was integrated into a dust-removal system in the primary processing line by Profibus-DP via adding a converter and an ET200S substation.The working modes included:manual, locked and automatic.The control signal was transferred by a DP/DP coupler basing on Profibus-DP protocol.7 label groups were added to the server of monitoring system, the new added monitoring pictures helped to equipment monitor and control.Functions such as fault alarm and display, remote control, friendly operation, and etc, were realized in the improved system, and the running reliability of equipment was increased.