Controllable　growth　of　nanostructured　tungsten　trioxide　(WO3)　films　grown　on　substrates　with　good　adhesion　in　a　single-step　process　is　still　challenging.　In　this　paper,　immobilized　WO3　nanostructures　with　different　microstructure　and　morphology　were　prepared　by　solvothermal　methods　in　various　solvents.　X-ray　diffraction　(XRD),　scanning　electron　microscope　(SEM),　Transmission　Electron　Microscopy　(TEM),　Energy　Dispersive　Spectroscopy　(EDS)　and　Raman　spectra　results　showed　that　the　type　of　solvents　has　a　great　influence　on　the　microstructure,　morphology　and　elemental　component　of　as-prepared　WO3　nanostructures,　and　their　growth　process　had　been　analyzed　with　the　vapor　pressure　and　viscosity.　The　electrochromic　studies　for　the　WO3　nanostructures　(nano-wire　arrays)　synthesized　in　ethanol　exhibited　low　electrochemical　impedance　spectroscopy　(EIS),　high　peak　current　density,　and　efficient　electron　hole　separation　efficiency　with　respect　to　other　products.　The　nanowire　arrays　showed　the　highest　photocatalytic　performance,　and　the　degradation　rate　can　reach　93.3%　in　1　h.　It　is　deduced　that　the　excellent　photocatalytic　performance　was　mainly　attribute　to　the　efficient　charge　transfer　capability.