To　study　the　effects　of　the　heavy-duty　gantry　CNC　machine　tools　concrete　foundation　on　whole　machine　stiffness,　this　paper　first　proposed　a　constitutive　model　of　reinforced　composite　foundation　that　could　calculate　space　mesh　reinforcement,　establish　transversely　isotropic　concrete　foundation　by　boundary　element　equations,　establish　whole　structure　model　based　on　finite　element　method,　and　thus　complete　establishing　an　upper　and　lower　structure　finite　element-boundary　element　coupling　model.　Through　practical　examples,　experiment　of　fiber　Bragg　grating　method　got　the　each　component　distribution　points　strain　values,　on　the　double　integral　of　curvature　at　the　distribution　point　determined　part　deformation　curve.　Meanwhile,　deformation　simulation　analysis　was　carried　out　under　the　action　of　load,　and　the　validity　of　the　theoretical　model　was　verified.　Finally,　bearing　deformation　of　foundation　of　different　reinforcement　layers　was　studied,　and　some　suggestions　were　obtained　based　on　this　theoretical　model.　The　results　provide　a　basis　for　the　construction　of　the　foundations　of　a　heavy-duty　machine　tool　and　the　selection　of　an　optimization　scheme　thereof.　©　2016,　Beijing　University　of　Technology.　All　right　reserved.