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With the research on the emergency disposal, we build a new contingency scheme model based on the Petri net. The model can meet the needs of the emergency disposal of large ceremony. With this model, we can realize the automatic scheduling of the contingency scheme, control according to the feedback and help the commander to make the decision. It will make all people and departments work in harmony and shorten the response time. The model was used in the 29th Beijing Olympics opening ceremony and closing ceremony successfully.