As　a　kind　of　cheap　transition　metal　oxide,　tungsten　oxide　has　good　performance　in　photochromic,　electrochromic,　photocatalytic,　and　ultra-capacitor　and　is　widely　used　in　smart　windows,　catalysts,　solar　cells,　and　gas-sensitive　sensing　equipment,　etc.　Tungsten　oxide　with　nano　structure　possesses　many　unique　properties,　such　as　the　increased　specific　surface　area,　changed　surface　energy,　and　quantum　limited-domain　effects,　which　has　made　the　fabrication　of　nano-tungsten　oxide　become　a　hot　spot　in　recent　years.　There　are　many　methods　for　preparing　nano-tungsten　oxide,　including　gas　phase　method,　liquid　phase　method,　solid　phase　method,　etc.　Hydrothermal/solvethermal　method　refers　to　a　me-thod　that　crystal　growth,　synthesis,　and　sintering　under　the　condition　of　high　temperature　and　high　pressure　in　a　closed　container　by　heating　to　produce　a　high-pressure　environment.　Compared　with　solid　phase　sintering,　hydrothermal/solvethermal　method　makes　the　crystal　less　defects　during　the　growth　process　for　its　lower　synthetic　temperature;　compared　with　the　atmospheric　pressure　heating　method,　hydrothermal/solvethermal　method　makes　the　crystal　more　crystallinity　for　its　higher　synthetic　pressure,　and　furthermore,　the　method　can　induce　the　formation　of　new　products　since　the　properties　of　reactant　may　changed　in　a　high-temperature　and　high-pressure　environment.　Moreover,　the　strong　convection　during　hydrothermal/solvethermal　can　make　the　mass　transfer　more　uniform　and　rapid,　and　the　smaller　temperature　gradient　can　also　make　the　crystal　growth　higher　and　more　uniform.　Because　of　the　advantages　of　environmental,　low-cost,　facile　processes,　and　easy　control　of　products,　hydrothermal/solvethermal　method　are　more　and　more　popular　and　are　becoming　the　main　method　for　preparing　tungsten　oxide　with　different　dimensions,　morphologies　and　structures.　In　order　to　control　the　structure　and　morphology　of　oxide,　people　often　choose　different　kinds　of　additives　selectively;　or　change　experimental　conditions,　parameters;　even　through　various　doping.　The　diversification　of　preparation　led　to　the　diversity　of　the　growth　mechanism,　such　as　isotro-pic　growth,　preferentially　grow　caused　by　capping　agent,　driving　force　of　supersaturation,　self-assembling　(Ostwald　ripening,　Gibbs-Tomso　law,　decreasing　surface　area).　In　addition　to　the　traditional　applications,　it　is　also　reported　that　tungsten　oxide　can　be　used　in　fluorescence　sensor,　bio-imaging,　photochromic　inks,　and　nuclear　fuel　cycle　after　the　improvement　of　their　structure　and　morphology　recently.　Above　all,　there　are　obviously　advantages　of　preparation　tungsten　oxide　by　hydrothermal/solvethermal　method.　Thus,　it　is　necessary　to　make　a　systematic　summary　of　this　field.　In　the　paper,　the　formation　mechanism　and　application　properties　of　tungsten　oxide,　which　synthesized　by　hydrothermal/solvothermal　method　are　presented　and　summarized　based　on　their　different　structures,　and　also　the　research　and　develop　trend　are　prospected.　©　2019,　Materials　Review　Magazine.　All　right　reserved.