Product　conceptual　design　often　depended　on　the　designer＇s　experience　to　translate　the　customer　requirements　into　function　requirements,　which　brought　negative　influence　in　design　progress　and　effectiveness.　Based　on　this,　an　automatic　conversion　model　of　customers＇　requirements　based　on　Quality　Function　Deployment　(QFD)　was　proposed.　First,　conversion　of　customer　requirement　in　QFD　was　analyzed.　Then　an　automatic　system　conversion　model　of　customer　requirement　based　on　QFD　was　put　forward.　According　to　the　different　degree　of　innovation,　evolutionary　search　mode　and　innovative　search　mode　were　designed.　Grey-association　theory　and　apriori　algorithm　were　introduced　to　carry　out　searches　with　different　modes　in　a　knowledge　base,　customer　requirement　were　automatically　mapped　into　function　technical　characteristics.　Finally,　an　automatic　mapping　system　was　developed　and　feasibility　of　the　mapping　system　was　validated　by　a　case　study.