To　meet　the　requirements　of　green　housing　industrialization,　a　fabricated　composite　structure　of　thin　slab　with　lightweight　steel　frame　and　single-row　reinforcement　was　developed.　The　lightweight　steel　frame　and　the　prefabricated　composite　structure　units　were　tested　under　low　cyclic　loadings.　The　influence　of　recycled　concrete　filling　on　the　light　steel　frame　and　the　effects　of　the　oblique　reinforced　support,　the　thickness　of　the　slab　and　the　cross　section　of　the　light　steel　frame　on　the　mechanical　properties　of　the　composite　structure　were　analyzed.　The　results　show　that　compared　with　the　empty　steel　frame,　the　steel　frame　filled　with　recycled　concrete　has　better　mechanical　property.　The　composite　structure　for　the　thin　slab　with　the　steel　frame　exhibits　two　seismic　lines　in　the　process　of　stress.　The　Park-Ang　damage　index　is　suggested　to　determine　the　damage　index　for　the　assembled　structure　in　different　damage　stages,　which　can　provide　reference　for　aseismic　design.　©　2018,　Editorial　Department　of　Journal　of　Southeast　University.　All　right　reserved.