Na2Ti7O15　nanotubes　on　a　Ti　net　substrate　were　fabricated　for　the　first　time　and　used　directly　as　a　binder-free　anode　for　Na-ion　batteries.　This　material　exhibited　high　reversible　capacity　and　excellent　stability　which　might　be　due　to　its　unique　characteristics　including　the　porous　substrate,　nanoscale　large　surface　area,　nanotube　structure　and　so　on.