In　order　to　evaluate　the　seismic　performance　of　prefabricated　underground　structures　and　promote　their　application　in　underground　engineering,　a　method　for　calibrating　the　limit　values　of　the　seismic　performance　index　of　prefabricated　subway　station　structures　was　proposed.　Then,　based　on　the　incremental　dynamic　analysis　method,　the　seismic　vulnerability　curves　of　the　two-story　three-span　prefabricated　subway　station　structure　in　different　site　categories　were　established,　and　the　damage　probabilities　of　different　performance　states　were　evaluated.　The　analysis　results　show　that　seismic　characteristics　and　site　categories　have　significant　influence　on　the　dynamic　response　of　prefabricated　subway　station　structure.　The　lower　the　equivalent　shear　wave　velocity　of　the　site,　the　more　significant　the　effect　of　ground　motion　on　underground　structure　and　the　easier　it　is　to　suffer　from　seismic　damage.　In　the　case　of　seismic　fortification　of　9-degree　(APG　is　0.4g),　when　this　structure　is　embedded　in　class　I　site,　only　6.7%　of　the　probability　of　damage　occurs　and　the　damage　is　minor;　in　class　II　site,　the　probability　of　minor　damage　is　26.3%,　and　the　probability　of　exceeding　minor　damage　is　3.8%;　the　structure　in　class　II　site　is　dominated　by　minor　damage　and　moderate　damage,　the　probabilities　are　42.1%　and　20.5%　respectively,　and　the　probability　of　exceeding　moderate　damage　is　10.8%.　At　the　same　time,　the　given　vulnerability　curves　and　damage　probability　table　of　the　two-story　three-span　prefabricated　subway　station　structure　can　be　used　to　quickly　evaluate　the　seismic　performance　of　this　type　structure.　©　2023　Science　Press.　All　rights　reserved.