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As the conceptual design of air-conditioning is done using the theory of Quality Function Deployment (QFD), customer requirements should be understood and the product competitive power be analyzed as exactly as possible for new product designing. Lots of information in the process of this research is fuzzy and uncertain, but traditional QFD can not deal with it well. Fuzzy theory can solve the problem. So a fuzzy model for analyzing product competitive power is formulated in this paper to improve traditional QFD, after that it is applied to analyze air-conditioning competitive power. When air-conditioning competitive power is analyzed using this model, firstly the importance weight of the customer requirements of air-conditioning is determined using the Analytic Hierarchy Process (AHP) weighting process, then air-conditioning competitive power is evaluated using fuzzy comprehensive evaluation. It is proved that the model is feasible and has good applicability.