Abstract: In allusion to inconsistency between fuzziness of customer requirement information and accuracy of design case characteristic value in agricultural machinery design retrieval, on the basis of analysis of fuzzy customer requirement information presentation, relevant membership function was developed to transform design case characteristic value into fuzzy customer requirement information membership grade. According to the principle of maximum weighted membership grade, the best matching design case was found out. Finally, the detailed process of agricultural harvester design retrieval based on fuzzy customer requirement information was given. An example shows that this method is feasible and effective.