Abstract: The centralized control system of Daliu Plant is an ageing system which unmatchable with the existing coal washing operations and is low in anti interference capability and incomplete in functions, making it impossible to meet the operational and management requirements. To address this issue, the system is renovated in a way as follows: redesign of the structure system, upgrading of hardware facilities, design of configuration interface, setting-up of voice alarm and video monitoring and control integrated interlinking system, and addition of management and remote supporting functions. Application of the renovated system shows that it works stably, enabling the plant to operate with an extended time of 180 hours a year, reduce 12 operators and gain an additional annual economic revenue of 1.66 million yuan. The system proves to be safe, reliable and highly effective, enhancing, as a result, the automation and informationization level and economic performance of Daliu Plant. The renovation work made may serve as a valuable reference for the old and outdated plants in Longdong area to make similar renovation or upgrading work.