With　the　development　of　the　worldwide　industries,　environmental　pollutions　regarding　the　greenhouse　gas　carbon　dioxide,　which　is　the　ultimate　oxidative　product　of　carbon-containing　substance　(or　compound),　have　aroused　extensive　attention　of　the　world.　The　most　promising　approach　to　restrain　its　emission,　as　suggested,　is　that　carbon　dioxide　could　be　used　as　a　monomer　for　alkenes＇　inversion　and　reutilization.　A　theoretical　maximal　yield,　and　also　better　understanding　of　the　reaction　system,　can　be　achieved　from　the　thermodynamic　investigation　in　chemical　reaction　engineering,　which　will　thereby　provide　a　favorable　evaluation　of　the　chemical　catalyst　effect　and　further　guide　the　exploitation　of　catalysts.　The　balanceable　reaction　system　for　hydrogenation　of　carbon　dioxide　to　light　alkenes　was　thermodynamically　investigated.　The　thermodynamic　parameters　for　the　catalytic　system　were　solved　by　means　of　mathematics,　and　the　relations　between　equilibrium　constitute,　temperature,　pressure　and　carbon/hydrogen　ratio　in　the　reaction　system　were　analyzed.　The　result　showed　that　the　maximum　conversion　of　carbon　dioxide　falls　in　69%　similar　to　71%.