In　order　to　solve　the　problem　that　reinforcement　is　easy　to　rust　in　coastal　environment,　combined　with　the　rapid　construction　technology　of　segmental　assembled　pier,　a　segmental　prefabricated　assembled　pier　with　2304　stainless　steel　reinforcement　and　GFRP　reinforcement　is　designed.　The　numerical　simulation　model　of　hybrid　reinforced　pier　is　established　by　ABAQUS　finite　element　software,　and　its　hysteretic　performance　under　low　cyclic　load　is　analyzed.　The　finite　element　model,　the　correctness　of　which　is　verified　by　comparing　with　the　test　results,　is　used　to　further　explore　the　effects　of　unbonded　section　length,　axial　compression　ratio　and　shear　span　ratio　of　GFRP　reinforcement　on　the　seismic　performance　of　segmental　assembled　piers.　The　numerical　results　show　that　the　bearing　capacity　of　segmental　assembled　piers　increases　with　the　decrease　of　the　length　of　unbonded　GFRP　reinforcement.　The　longer　the　length　of　unbonded　section,　the　smaller　the　local　stress　of　GFRP　reinforcement　and　the　better　the　displacement　ductility,　but　the　energy　consumption　of　pier　column　becomes　smaller.　It　is　suggested　that　the　length　of　unbonded　section　of　GFRP　reinforcement　should　be　between　40%~80%,　so　as　to　ensure　that　the　pier　has　good　seismic　performance　and　avoid　sudden　fracture　due　to　stress　concentration　of　GFRP　reinforcement.　By　increasing　the　axial　compression　ratio,　the　increase　of　the　bearing　capacity　of　the　specimen　is　not　obvious;　the　shear　span　ratio　of　the　specimen　increases　from　4.5　to　9.5,　and　the　horizontal　bearing　capacity　of　the　specimen　decreases　by　63%.　This　study　lays　a　foundation　for　the　subsequent　experimental　study　on　the　seismic　performance　of　post　tensioned　prestressed　composite　reinforced　piers.　©　2023　Science　Press.　All　rights　reserved.