The　controlled　preparation　of　hexagonal　tungsten　trioxide　(h-WO3)　nanostructures　was　achieved　by　adjusting　the　pH　of　the　precursor　solution.　The　effect　of　the　pH　on　the　morphology,　elemental　composition,　and　photocatalytic　performance　of　the　samples　was　characterized　via　X-ray　diffraction　(XRD),　scanning　electron　microscopy,　energy　dispersive　X-ray　spectroscopy,　and　Raman　spectroscopy.　Ultraviolet-visible　(UV-Vis)　spectra　were　used　to　evaluate　the　absorbance　and　the　photocatalytic　performance　of　methylene　blue.　Photoluminescence　(PL),　electrochemical　impedance　spectroscopy,　photocurrent　response　and　Brunauer-Emmett-Teller　(BET)　were　used　to　study　the　optical　properties,　electrical　performance,　and　specific　surface　area　of　the　WO(3-)nanostructures,　respectively.　The　results　indicate　that　the　WO(3)nanorods　prepared　at　pH　=　1.0　exhibit　the　highest　photocatalytic　performance　(87.4%　in　1　h),　whereas　the　WO(3)nanoblocks　prepared　at　pH　=　3.0　show　the　lowest.　The　photocatalytic　performance　of　the　one　dimensional　(1D)-nanorods　can　be　attributed　to　their　high　specific　surface　area　and　charge　transfer　ability.　The　h-WO(3)nanostructures　were　synthesized　via　a　simple　method　and　without　a　capping　agent.　They　show　an　excellent　photocatalytic　performance,　which　is　promising　for　their　application　in　environment　purification.