Complex　geometric　features　and　stress　features　as　well　as　their　intricate　relationships　are　the　important　factors　causing　the　complexity　of　lightweight　for　large　component.　In　order　to　better　coordinate　the　stress　distribution　with　lightweight　goal,　a　knowledge-guided　lightweight　method　based　on　geometric-stress　feature　correlation　response　is　proposed.　Multistage　decomposition　and　three-steps　feature　express　strategy　is　utilized　to　construct　the　geometric　features　relationship　model　firstly.　By　combining　the　influence　significance　for　stress　features　with　the　association　grade　for　geometric　features,　and　reasoning　under　lightweight　expectations,　the　geometric-stress　correlation　knowledge　is　extracted.　Furthermore,　a　knowledge-guided　lightweight　algorithm　integrated　knowledge　correlation　response　with　intelligent　searching　is　proposed.　Finally,　the　lightweight　of　X-type　caterpillar　frame　is　taken　as　example　to　demonstrate　the　effectiveness　of　this　method.　©　Published　under　licence　by　IOP　Publishing　Ltd.