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Virtual experiments have been used in education for a long time. However, most of the virtual experiments are modeled only for some special subjects, and are programmed case by case. To handle these problems, an online system of Virtual Educational Experiments (VEEs) is designed to develop various virtual experiments and simplify the virtual experiment modeling by reusing the existed experiment components. Based on the system of VEEs, we proposed a method of modeling and visualizing dynamic experiment components. Firstly, the dynamic experiment components are modeled based on the combination of images and graphics. Then the visualization of the dynamic experiment components is designed for multidisciplinary virtual experiments. The system has been running in some colleges and universities for several months. The tests show that it can rapidly model dynamic experiment components and realistically visualize the dynamic experiment components for the system of VEEs.