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With the wide applications of automobile intelligent design systems, knowledge base inevitably accumulates a large amount of obsolete, redundant information, which seriously affects the efficient reuse of design knowledge. In order to improve the accuracy of design knowledge evaluation, AHP (analytic hierarchy process) was introduced into the evaluation expert system of automobile intelligent design knowledge. The evaluation indicator system of this knowledge was established, and its analysis and evaluation process was studied. Through evaluating the design knowledge effectively, the optimization of an automobile intelligent design knowledge database could be made into reality, which would help improve the quality and efficiency of intelligent design. [ABSTRACT FROM AUTHOR]