The　high-density　characteristic　of　heavy　concrete　is　the　main　factor　affecting　its　excellent　radiation　protection　performance.　The　heavy　concrete　commonly　used　in　the　nuclear　power　plant　structure　are　hematite　concrete　and　barite　concrete.　Based　on　the　finite　element　method,　the　finite　element　models　of　three　transfer　and　purging　rooms　of　nuclear　power　plant　were　established.　The　models　used　C40　ordinary　concrete,　C40　hematite　concrete　and　C40　barite　concrete　respectively.　Modal　analysis　and　seismic　response　time　history　analysis　were　carried　out　for　the　three　models　to　discuss　the　dynamic　response　characteristics　and　seismic　performance　of　the　transfer　and　purging　rooms,　and　to　analyze　the　influence　of　heavy　concrete　on　the　natural　vibration　characteristics　and　seismic　response　of　the　transfer　and　purging　rooms.　The　results　show　that　the　structural　stiffness　of　the　transfer　and　purging　rooms　is　large,　the　natural　vibration　period　is　short,　the　response　to　the　ground　motion　is　small,　and　the　structure　is　still　working　in　an　elastic　state,　and　the　hematite　concrete　has　little　effect　on　the　natural　vibration　characteristics　and　seismic　response　of　the　transfer　and　purging　rooms,　while　the　barite　concrete　can　significantly　prolong　the　natural　vibration　period　of　the　transfer　and　purging　rooms　and　amplify　the　seismic　response　of　the　structure.　The　structure　of　transfer　and　purging　rooms　has　a　sufficient　safety　margin,　and　the　transfer　and　purging　rooms　using　heavy　concrete　can　fully　meet　the　requirements　of　structural　seismic　performance.　©　2023