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In the dynamic and multi-task condition of air traffic control, an Air Traffic Controller (ATCO) must utilize effective strategies to control traffic to prevent potential collision of aircraft and also to reduce his cognitive workload. Therefore, the strategy building skill of an ATCO is quite important for aviation safety and efficiency. In the present research, for supporting education of strategy building, a function which can visualize the difference of task performance has been implemented into the Air Traffic Controller Cognitive Simulation (ATCCS). Using this function, the effect of ATCO’s control on air traffic flow has been successfully visualized, which helps trainee to understand the differences of the consequences of the different strategy. This result has strongly implied that ATCCS equipped with performance visualization function can be utilized as a supporting tool for education of ATCO trainees.