Abstract: Intelligent construction of coal preparation plants constitutes one of the vital links for the high-quality development of the coal enterprise. In order to improve the coal washing efficiency and product quality of an traditional coal preparation plant, it is required to get the new-generation information technology fully integrated in its coal washing operation management process. However, due to complexity of washing systems, relative scattering of system data and lack of analysis and evaluation functions, the relevant data of systems is rendered difficult to process and there exist operation safety-related problems. To tackle the problems, the B/S architecture-based system architecture with relevant functional modules is developed at Zhangjiamao Coal Preparation Plant through linking-up and deep integration of various systems, and in line with the plant's specific control requirements and operation processes. The control system developed can perform multiple functions. Such as sending of control instructions through browser pages, analysis of data, management of reports, comprehensive inquiry, etc. Practice shows the system offers the special merits of having multiple supportings, flexible configuration, extensive protocol support and visualized high-efficiency presentation functions. The use of system has led to overall enhancement of the control capability of the plant and made it possible for the traditional plant to achieve the anticipated goal of making intelligent upgrading of its control and monitoring system thanks to the remarkable performance and expandability of the control system.