In order to improve the convenience of simulation system operation, for the purpose of developing online simulation platform, this paper expounds the Web architecture design scheme based on Django, selected the single-capacitance water tank level control system as the research object, uses Python language to configure the difference model of the object in the Web background, The visual interface based on SVG is designed by Ajax technology. The results show that users can simulate the dynamic process of water tank liquid level in real time through the browser, which meets the requirements of online training.