3D　reconstruction　has　turned　out　to　be　a　significant　need　in　Computer　Aided　Design　(CAD)　technology.　With　the　rapid　development　of　virtual　reality　and　industry　design,　more　and　more　3D　models　are　required　in　practical　needs.　So　an　artificial　neural　network　based　system　scheme　is　presented　in　this　paper,　which　can　be　used　in　3D　object　reconstruction　from　single　2D　image.　BP　neural　network　(BP　NN)　is　applied　in　our　system　due　to　its　non-linear　mapping　and　self-adaptive　ability.　The　3D　objects　are　represented　by　Open　Inventor,　which　is　a　3D　software　development　kit　based　on　OpenGL.　Experimental　results　show　that　neural　network　is　a　promising　approach　for　reconstruction　and　representation　of　3D　objects.