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Flight safety is an important problem in aviation industry and flight accidents are the result of multi-elements which affect each other. In order to analyze the development process of flight accidents, from the view of system safety, the flight process was abstracted to a hybrid dynamic system based on discrete event dynamic system theory, and a systemic causal simulation model is discussed. Through brief analysis of elements affecting aviation flight safety, the relationship between them was obtained, and the simulation architecture for the aviation flight safety hybrid system (AFSHS) and the three core simulation models were constructed. Moreover, a example of simulation presented. The simulation model can be utilized to flight process safety analysis, and find out events combination that probably result in an incident or an accident.