Hydrogen　production　from　photoelectrochemical　(PEC)　water　splitting　using　semiconductor　photocatalysts　has　attracted　great　attention　to　realize　clean　and　renewable　energy　from　solar　energy.　The　visible　light　response　of　WO3　with　a　long　hole　diffusion　length　(similar　to　150　nm)　and　good　electron　mobility　(similar　to　12　cm(2)　V-1　s(-1))　makes　it　suitable　as　the　photoanode.　However,　WO3　suffers　from　issues　including　rapid　recombination　of　photoexcited　electron-hole　pairs,　photo-corrosion　during　the　photocatalytic　process　due　to　the　formation　of　peroxo-species,　sluggish　kinetics　of　photogenerated　holes,　and　slow　charge　transfer　at　the　semiconductor/electrolyte　interface.　This　work　highlights　the　approaches　to　overcome　these　drawbacks　of　WO3　photoanodes,　including:　(i)　the　manipulation　of　nanostructured　WO3　photoanodes　to　decrease　the　nanoparticle　size　to　promote　hole　migration　to　the　WO3/electrolyte　interface　which　benefits　the　charge　separation;　(ii)　doping　or　introducing　oxygen　vacancies　to　improve　electrical　conductivity;　exposing　high　energy　crystal　surfaces　to　promote　the　consumption　of　photogenerated　holes　on　the　high-active　crystal　face,　thereby　suppressing　the　recombination　of　photogenerated　electrons　and　holes;　(iii)　decorating　with　co-catalysts　to　reduce　the　overpotential　which　inhibits　the　formation　of　peroxo-species;　(iv)　other　methods　such　as　coupling　with　narrow　band　semiconductors　to　accelerate　the　charge　separation　and　controlling　the　crystal　phase　via　annealing　to　reduce　defects.　These　approaches　are　reviewed　with　detailed　examples.