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In this paper, based on the Quality Function Deployment (QFD) method, the Fuzzy Quality Function Deployment (FQFD) theory and the step-by-step hierarchy structure in aircraft top decision design are studied. The fuzzy model for computing competitive factor in evaluation is presented.The decision of key technologies for improving the performance and affordability of a fixed-wing aircraft is studied using the model, and the result proves the feasibility of this model.