Ammonia　has　a　better　future　market　as　a　carrier　of　hydrogen　energy　and　renewable　energy　for　its　high　energy　density　and　carbon-free　characteristic.　Ammonia　is　easier　to　store　and　transport　than　hydrogen　and　is　intrinsically　safe.　It　is　expected　to　become　one　of　the　carbon-free　energy　development　routes　to　promote　industrial　reform,　social　progress　and　national　development.　From　the　perspective　of　the　whole　industrial　chain　of　ammonia　energy,　the　development　trend　of　synthetic　ammonia　industry,　and　the　latest　progress　and　cost　economy　of　various　synthetic　ammonia　technologies　are　introduced;　the　main　storage　and　transportation　methods,　efficiency,　cost　and　safety　characteristics　of　ammonia　are　listed;　the　new　energy　fuel　applications　of　ammonia,　including　ammonia　fuel　cell,　ammonia　internal　combustion　engine　and　ammonia　gas　turbine,　the　development　status　of　the　technologies　and　the　fuel　cost　economy,　as　well　as　the　hydrogen　production　efficiency　and　production　cost　advantages　of　ammonia　decomposition　are　reviewed.　Through　the　above　technical　and　economic　analysis,　the　importance　of　ammonia　energy　in　the　energy　system　is　discussed,　the　development　direction　of　ammonia　energy　technology　is　further　sorted　out.　©　2023　Chemical　Industry　Press.　All　rights　reserved.