The application discloses a kind of pre-tension prestressed frame
assembly structure system and its construction method, it includes concrete column, pre-tension prestressed thin bottom composite beam, pre-tension prestressed thin bottom composite board, post-tying steel framework and post-cast concrete, wherein, concrete column can be cast-in-place or prefabricated, column is made to floor place and reserves reinforcement and post-cast area;The pre-tension prestressed thin bottom composite beam is composed of prestressed steel strand, thinner concrete beam bottom plate,
stirrup, beam reinforcing rib, wherein, prestressed steel strand is used as part of force longitudinal reinforcement, beam bottom plate is laid with non-prestressed reinforcement, non-prestressed reinforcement includes bottom and top longitudinal reinforcement,
stirrup, wherein longitudinal reinforcement is anchored into concrete column, meets specification seismic requirement, enhances the overall performance and
ductility of structure.The application is laid with steel reinforcement perpendicular to reinforcing rib on the bottom plate of pre-tension prestressed thin bottom composite board, reinforcing rib has hole, steel reinforcement can be passed through reinforcing rib, composite floor can be bidirectional force transmission, and the overall structure is comparable to cast-in-place.