The　steel-plate　reinforced　concrete　shear　wall　with　rectangular　concrete　filled　steel　tube　(CFST)　columns　is　a　new　kind　of　composite　shear　wall.　In　order　to　ascertain　its　seismic　behavior　and　failure　mechanism,　four　1/5　scale　specimens　with　the　same　shear　span　ratio　1.5,　different　thickness　of　the　steel-plate　and　different　axial　force　ratio,　were　tested　under　horizontal　cyclic　loading.　The　thickness　of　steel-plate　in　the　walls　is　2mm,　4mm,　4mm　and　6mm,　respectively.　Based　on　the　experiment,　the　load-bearing　capacity,　hysteretic　characteristics,　ductility,　stiffness　degradation,　energy　dissipation　capacity　and　failure　mode　of　the　specimens　were　contrastively　analyzed.　And　the　effect　of　the　ratio　of　height　to　sectional　thickness　of　steel-plate　and　the　value　changes　of　axial　force　ratio　on　seismic　behavior　of　the　new　shear　wall　was　also　analyzed.　The　result　shows　that　the　steel-plate　reinforced　concrete　shear　wall　with　rectangular　CFST　columns　has　good　seismic　performance　and　important　engineering　value.