Abstract: To deal with the internal fuzziness in quality function deployment(QFD)system of drier,the models of fuzzy programming in correlation function and auto-correlation function are established by using fuzzy regression and fuzzy programming theory with symmetric fuzzy coefficients.Then the relationship between hvalue and the extended fuzzy coefficients is analyzed,and the method to find its best value is proposed.Simulation results show that the models can help to identify correlation function and auto-correlation function under the condition of uncertain and incomplete information in the product fuzzy design process.These results are usable in various modeling of house of quality.