The　fabrication　of　three　dimensional　micro-nanostructured　TiO2　(3D-TiO2)　on　Ti　substrate　for　photocatalysis　has　attracted　continued　interests　from　both　scientific　research　and　industrial　applications,　mainly　due　to　the　structure-induced　properties　including　large　specific　surface　area,　superior　light　harvesting　capacity　and　prominent　carrier　mobility.　3D-TiO2　was　fabricated　through　femtosecond　laser　ablation　and　NaOH　hydrothermal　treatment.　The　structure,　morphology,　and　phase　of　3D-TiO2　were　examined　by　laser　confocal　scanning　microscopy　(LCSM),　SEM,　TEM　and　XRD.　Results　show　that　asfabricated　3D-TiO2　is　composed　of　microarrays　and　nanowires,　fabricated　by　femtosecond　laser　ablation　and　NaOH　hydrothermal　treatment,　respectively.　The　3D-TiO2　exhibites　enhanced　performances　in　absorption　ability　and　photocatalytic　efficiency　than　TiO2　nanowires　grown　on　flat　Ti　surface,　which　directly　result　in　obvious　improved　photodegradation　efficiency　(100%　and　37%　increase　for　absorption　ability　and　photocatalytic　efficiency　respectively).　In　addition,　the　width　and　depth　of　the　femtosecond　laser　ablated　microarrays　significantly　affect　the　photocatalytic　performances　of　3D-TiO2.　The　photocatalytic　activity　of　3D-TiO2　is　improved　with　the　decrease　of　width　or　increase　of　depth　due　to　higher　incident　light　harvesting　capacity　and　large　specific　surface.　©　2017,　Editorial　Office　of　CHINA　SURFACE　ENGINEERING.　All　right　reserved.