Abstract: Targeting the problem of joint prone to break off, leading to stripping damage of FWPs (filament wound profile)joints, flexural behavior experiment is carried out on a newly designed FWP joint. The damage process under different working conditions, maximum bearing capacity and stiffness are studied, and are compared with the flexural behavior of FWP itself. Research discovers that the sign of new FWP joint enter-ing plastic stage is the side bond failure between FWPs and steel plate. Under negative bending moment condition, the joint flexural behavior performance is weak, hence the FWP joint should not be arranged in the negative bending moment area of the tunnel. The flexural capacity and stiffness of joints alone are weaker than that of FWPs, so joints should be placed at the reverse bending point of the tunnel structure. The new joint is successfully applied and no break-off cases detected in tunnel lining ring test.