To　solve　the　problem　of　heavy　weight　of　assembled　metro　station　components,　based　on　the　engineering　background　of　the　first　all-prefabricated　metro　station　in　Changchun　Metro,　the　optimization　design　of　the　closed　cavity　structure　of　an　assembled　metro　station　was　carried　out　based　on　the　large-scale　finite　element　software　ABAQUS.　Through　the　analysis　of　the　whole　(single　ring)　and　the　block　(each　component),　a　series　of　optimization　measures　for　the　closed　cavity　structure　were　put　forward.　Finite　element　numerical　simulation　contrast　test　shows:　after　the　optimization　of　the　closed　cavity　structure,　the　single　ring　structure　had　no　substantial　changes　in　its　performance　under　the　self-weight,　and　the　value　of　each　monitoring　index　was　far　less　than　the　specification　limit.　The　structural　weight　decreased　by　18.5%,　and　the　internal　forces　of　the　structure　were　reduced　to　different　extents.　The　effect　on　the　bending　moment　was　the　greatest,　the　shear　force　was　the　second,　and　the　axial　force　was　the　smallest.　Its　trend　was　beneficial　to　the　structure.　The　test　verified　the　safety　and　reliability　of　the　closed　cavity　structure.　©　2019,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.