A　novel　precast　horseshoe　segmental　tunnel　(PHST)　structure　was　applied　in　the　construction　of　the　west　extending　project　of　Beijing　Subway　Line　6.　The　seismic　performance　of　the　PHST　was　one　of　the　critical　difficulties　for　the　engineering　project.　A　series　of　investigations　were　conducted　to　deal　with　the　problem,　including　the　1-g　shaking　table　model　tests　of　the　PHST　buried　in　sand.　In　the　present　study,　the　experimental　setup,　construction　of　the　PHST　model　(tube),　dynamic　properties　of　the　soil-tube　system,　deformation　mode　and　damage　patterns　of　the　tube　were　introduced.　The　preliminary　results　show　that　the　tube　had　a　very　slight　influence　on　the　dynamic　properties　of　the　soil-tube　system,　which　was　consistent　with　the　traditional　learning.　Under　seismic　motions　with　the　precautionary　intensity　of　the　prototype　site,　the　dynamic　properties　of　the　soiltube　system　were　not　varied.　The　seismic　responses　of　the　tube　were　within　the　linear　range.　With　the　increasing　seismic　intensity,　the　predominant　frequencies　of　the　soil-tube　system　were　firstly　decreasing　and　then　tended　to　be　rather　steady;　meanwhile,　the　viscous　damping　ratio　was　firstly　increasing　and　then　rather　steady.　Under　the　excitations　of　the　rare　seismic　motions,　the　non-linear　responses　of　the　tube　were　observed.　The　connection　regions　were　damaged　and　tended　to　failures.　Under　the　effects　of　the　very　rare　motions,　the　thorough　failures　were　observed　at　the　connections.　The　tube　was　developed　as　a　multi-hinge　mechanism.　The　damage　patterns　at　the　connections　were　flexural　damage　and　shear　slide　between　segments.　After　the　actions　of　strong　motions,　the　tube　kept　horizontally　expanding　and　vertically　shrinking.