Abstract: In recent years，with the application of big data and cloud computing technology in the refining and chemical industry，the model optimization of product structure and operating conditions can significantly improve the benefits of refining and chemical enterprises. With the operation of the unit, the circulating water side of the heat exchanger in the refinery shows different deterioration tendency in many dimensions, such as pH, electrolyte composition, conductivity,and so on. By means of visual analysis, the operation parameters can be decoupled, the process of circulating water treatment can be controlled quantitatively, and energy saving and emission reduction can be promoted to the greatest extent. Cloud platform is used as the base of model deployment and Vue.js as the front-end framework to realize the key functions of data storage,visualization,and so on. The intelligent circulating water data analysis system is constructed，which integrates the multi-dimensional circulating water analysis data. The realization of the functions of the system such as data storage,visualization,data optimization,on-line diagnosis was introduced,and an application case of the system in the process of circulating water treatment optimization in a refinery was presented.

Key words: circulating water system, cloud computing, visualization