Abstract: The present situation of export market of agricultural machinery in China was analyzed.Reasons why export-oriented agricultural machinery did not conform to international agricultural machinery trade market were analyzed，and the necessity of optimizing design of export-oriented agricultural machinery was deduced.Analytic Hierarchy Process（AHP）was used to synthetically evaluate design optimization of export-oriented agricultural machinery in China，which was typical of combine harvester.Relevant strategies and key evaluation system of design optimization were obtained.