Owing　to　the　wide　applications　of　ammonia　in　hydrogen　field　and　high　energy　consumption　of　the　Haber-Bosch　process,　developing　economic　and　environmentally　benign　ammonia　synthesis　process　has　attracted　great　interests.　This　work　focuses　on　the　moderately　high　two-step　solar　water-splitting　of　VN　to　produce　ammonia,　thus　avoiding　the　reliance　of　fossil-fuel　based　heating　source　and　pure　hydrogen.　Based　on　the　equilibrium　composition　analysis,　we　find　that　V2O3,　CH4　and　N-2　with　mole　ratio　of　1:3:1.5　at　T-H　=　1050　degrees　C　is　enough　for　complete　methane　reforming　and　sufficient　nitrogen　fixation　of　V2O3.　As　for　the　water-splitting　of　VN,　the　production　of　NH3　is　only　possible　at　T-L　＜=　400　degrees　C,　and　inputting　excessive　water　vapors　is　found　to　exert　little　effect　on　ammonia　production　at　H2O:AlN＞3:2.　At　the　temperature　range　of　full　conversion　between　V2O3　and　VN,　the　cycle　efficiency,　eta(cycle),　and　solar-to-fuel　efficiency,　eta(solar-to-fuel),　under　different　operating　temperatures　are　compared,　in　which　the　highest　eta(cycle)　and　eta(solar-to-fuel)　are　31.9%　and　35.3%　respectively.　Moreover,　efficiencies　could　be　increased　up　to　more　than　37%　with　consideration　of　heat　recuperation,　demonstrating　the　great　solar　energy　storage　and　fuel　production　potential　of　the　proposed　system.　(C)　2019　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.