Sulfur-doped　anatase　TiO2　was　prepared　through　a　calcination　conversion　route　for　the　first　time.　The　grain　size　of　TiO2　with　S-doping　obviously　decreased　after　S-doping,　manifesting　that　the　introduction　of　S　species　could　inhibit　the　crystal　growth.　Applied　as　an　anode　material　for　sodium-ion　batteries,　this　material　exhibited　an　impressive　specific　capacity　of　174.4　mA　h　g-1　at　a　high　current　density　of　10　C　after　10　000　cycles.　The　remarkable　performance　results　from　the　unique　crystal　structure　of　anatase　TiO2　with　bidirectional　pore　channels　for　sodium-ion　intercalation,　and　S-doped　TiO2　could　increase　the　electronic　conductivity,　as　well　as　enlarge　the　channel　structure.　Furthermore,　density　functional　theory　calculations　manifested　that　the　S-doping　increases　the　volume　of　the　lattice　slightly,　leading　to　the　ease　of　insertion　for　sodium　ions　into　anatase　TiO2　and　a　reduced　band　gap　with　higher　electronic　conductivity.　Therefore,　S-doped　TiO2　showed　high　reversible　capacities　and　excellent　long-term　cycling　performance.　©　2019　American　Chemical　Society.