To　improve　the　efficiency　of　photocatalytic　water　decomposition,　nanosized　photocatalyst　InVO4　was　synthesized　by　template-directing　self-assembling　method.　The　crystal　structures,　morphologies,　surface　areas,　and　photon　absorption　of　the　synthesized　InVO4　were　characterized　by　means　of　XRD,　TEM,　SEM,　BET,　and　UV-vis　techniques,　respectively.　The　effects　of　precursor-to-template　mol　ratio,　pH　value,　crystallization　temperature,　extraction,　and　calcination　temperature　have　been　investigated.　And　the　abilities　of　visible　light　respondence　of　nano-InVO4　and　anatase　TiO2　have　been　compared.　Results　show　that　nano-InVO4　with　different　crystal　structures　can　be　selectively　obtained　by　changing　the　precursor-to-template　ratio　in　the　starting　materials　or　by　changing　the　calcination　temperature.　The　ability　of　visible　light　respondence　of　nano-InVO4　is　greatly　improved　than　that　of　antase　TiO2,　and　it　can　evolve　hydrogen　from　water　in　a　rate　of　16.6　mmol/(g·h)　under　UV　light　irradiation,　which　is　far　better　than　InVO4　synthesized　by　solid-state　method.