Abstract: To improve the axial compression performance of rectangular cross-section concrete columns, a dual confinement by external fiber reinforced polymer (FRP) jackets and internal continuous FRP ties was proposed, which enhances the behavior of longitudinal FRP bars and improves the compressive behavior of confined concrete. 18 large-sized rectangular cross-section concrete columns externally confined with FRP jackets were designed and tested under axial compression using a 1000 - ton press to investigate the confinement effect of such composite members. Key variables including tie type and combination form, jacketing layers and tie spacing were analyzed for their effects on the failure modes and load-strain curves of the specimens. Test results show that continuous FRP ties provide superior confinement to core concrete compared with traditional FRP ties and steel bar specimens, with the external rectangle-internal circle composite tie configuration being optimal. External FRP jackets inhibit the crushing and spalling of concrete cover, delay the premature buckling of longitudinal FRP bars, and ensure the exertion of the compressive performance of longitudinal bars under large axial deformation. Increasing FRP jacket layers or reducing tie spacing improves the axial compression bearing capacity and ductility of the specimens; high bearing capacity and good ductility are achieved when the tie spacing is 75 mm and the columns are externally wrapped with 4 FRP sheets. Based on the test results in this paper, a monotonic compressive constitutive model of concrete considering the dual confinement of FRP jackets and continuous fiber FRP ties was established, providing a theoretical basis for the application of such rectangular cross-section columns.