Catalytic　reactions　involving　hydrogen　over　reducible　oxide-supported　metal　catalysts　are　inseparable　from　the　hydrogen　storage　capacity　and　hydrogen　migration,　which　are　mainly　dependent　on　the　interaction　between　reducible　oxides　and　active　metals.　In　this　work,　we　report　that　the　hydrogen　migration　rate　of　Ru/CeO2　could　be　tuned　by　changing　cerium　nitrate　solvents　for　the　preparation　of　ceria.　There　are　more　kinds　of　oxygen　species　and　a　large　amount　of　Ce3+　concentration,　defects　and　Ru-O-Ce　interfacial　sites　for　Ru　catalyst　supported　on　ceria　obtained　by　ethanol-precipitated　synthesis,　resulting　in　a　reduction　in　the　amount　of　the　exposed　Ru　species　and　proportion　of　Ru　metal.　In　such　a　case,　the　migration　and　desorption　of　hydrogen　species　as　well　as　nitrogen　activation　would　be　inhibited.　Conversely,　there　are　a　higher　ratio　of　Ru　metal　and　a　great　deal　of　the　Ru　exposure　for　Ru　catalyst　supported　on　ceria　obtained　by　water-precipitated　synthesis,　facilitating　the　migration　and　desorption　of　hydrogen　species,　as　well　as　nitrogen　activation.　As　a　result,　the　water-precipitated　synthesized　ceria-supported　Ru　catalyst　has　4.9-fold　higher　in　catalytic　activity　than　Ru　catalyst　supported　on　the　ethanol　-precipitated　synthesized　ceria.　This　work　provides　insight　into　the　design　of　Ru　catalysts　used　ammonia　syn-thesis　by　controlling　hydrogen　spillover　and　migration　between　Ru　species　and　CeO2.