A　ternary　composites　of　MoO3/Ag/TiO2　nanotube　arrays　were　synthesized　by　in-situ　annealing　of　TiO2　nanotube　arrays　impregnated　with　AgNO3　over　MoO3　powders.　During　the　annealing　process,　the　crystallization　of　the　TiO2　nanotubes,　the　thermo-decomposition　of　AgNO3　to　Ag　nanoparticles,　and　the　sublimation　of　MoO3　occur　jointly.　The　photoelectrochemical　measurements　of　the　resultants　indicate　that　MoO3/Ag/TiO2　nanotube　arrays　present　better　photoelectrochemical　properties　compared　with　Ag/TiO2　nanotube　arrays　and　pristine　TiO2　nanotube　arrays.　Especially,　the　highest　photocurrent　and　open　circuit　voltage　are　up　to　21.29　μA/cm2　and　0.058　V　under　visible　light　irradiation,　whereas　1.77　and　3.87　times　larger　than　those　of　TiO2　nanotube　arrays,　respectively.　Superior　photoelectrochemical　stability　and　larger　photo-conversion　efficiency　of　the　ternary　composites　are　also　demonstrated.　The　improved　photoelectrochemical　properties　are　related　to　the　close　interfacial　contact　among　MoO3,　Ag,　and　TiO2　as　well　as　the　surface　plasma　resonance　of　Ag　in　the　ternary　composites,　which　broaden　the　range　of　light　response　and　enhance　the　efficiency　of　charge　separation.　This　study　provides　a　skillful　solution　to　construct　TiO2-based　composite　materials　and　demonstrates　it　is　an　unique　architecture　to　promote　the　visible　light　driven　photocatalytic　application　of　TiO2.　©　2019　Hydrogen　Energy　Publications　LLC