Ammonia　serves　as　a　viable　medium　for　hydrogen　storage　owing　to　its　significant　hydrogen　content　and　elevated　energy　density,　and　the　absence　of　carbon　dioxide　emissions　during　ammonia-to-hydrogen　production　has　inspired　more　research　on　ammonia　decomposition.　Despite　growing　interest,　a　significant　gap　persists　between　the　depth　of　existing　studies　and　the　practical　approach　to　on-the-spot　hydrogen　generation　using　ammonia　decomposition.　The　creation　of　effective　and　accessible　catalysts　to　feed　ammonia　decomposition　is　a　critical　step　in　addressing　this　daunting　challenge.　This　paper　systematically　summarizes　four　key　catalyst　design　strategies,　including　size　effect,　alkalinity　modulation,　metal-support　interactions,　and　alloying,　informed　by　experimental　and　theoretical　investigations　into　ammonia　decomposition.　Each　strategy＇s　underlying　mechanism　for　enhancing　ammonia　decomposition　is　elucidated　in　detail.　Moreover,　the　paper　categorizes　catalysts　employed　in　existing　ammonia　decomposition　reactors　to　guide　future　catalyst　development.　The　influence　of　diverse　energy　sources　and　reactor　configurations　on　catalyst　performance　is　also　discussed　to　provide　a　comprehensive　framework　for　advancing　ammonia　decomposition　catalyst　research.Keywords:　Ammonia　decomposition　reaction;　Catalyst　design;　Particle　size　effect;　Adjustment　of　alkalinity;　Strong　metal-support　interaction;　Alloying　effect.