Civil aviation accident Human Factors analysis models were investigated in the article, mainly on the famous SHELL model and Reason model. Both the advantages and disadvantages of the models were fully discussed. After then, a new civil aviation accident Human Factors analysis model named O-SHELL was designed, which is the development of the SHELL model and Reason model. The O-SHELL model has the same systematic structure as the SHELL model, and also emphasizes the organizer's responsibilities like the Reason model. With the advantages of the two successful models and with out their disadvantages, the O-SHELL model makes the civil aviation accident Human Factors analysis become more systematic and clearly.
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