Aiming　at　the　problem　of　the　discontinuous　height　values　in　the　three-dimensional　reconstruction　of　tool　wear　area　for　grinding　wheel　using　the　method　of　depth　from　focus　(DFF),　a　new　method　for　continuing　the　height　values　with　DFF　is　proposed　by　using　Fourier　transform　to　combine　the　methods　of　DFF　and　shape　from　shading　(SFS).　Using　Fourier　transform　in　the　frequency　domain,　performing　highpass　filtering　for　the　3D　reconstruction　image　of　DFF　and　lowpass　filtering　for　the　3D　reconstruction　image　of　SFS,　and　superimposing　the　filtered　image　in　the　frequency　domain,　the　3D　reconstruction　image　of　the　tool　wear　area　of　grinding　wheel　can　be　obtained　by　inverse　Fourier　transform　to　fuse　in　the　spatial　domain.　Analysis　and　experimental　results　show　that　the　fused　3D　reconstruction　image　not　only　retains　the　discrete　geometric　height　information　contained　in　DFF　and　the　detailed　surface　information　contained　in　SFS,　but　also　effectively　avoids　the　errors　caused　by　the　discontinuous　height　values　in　the　DFF.　©,　2015,　Xi＇an　Jiaotong　University.　All　right　reserved.