Tensile constitutive response of hybrid fiber reinforced polymer (HFRP) bar plays a crucial role to characterize its tensile properties. An innovative model with five stages, including the initial linear elastic stage, stress sudden drop stage, stress recovery stage, platform stage and strain hardening stage, was proposed to describe the stress-strain response of HFRP bar under the unidirectional tensile load. The proposed tensile constitutive model considered the influence of hybrid effect on the yield tensile strength and strain, while the post-yield tensile stress sudden drop was also taken into account. Subsequently, a series of carbon/glass-HFRP bars with different characteristics were independently produced by the pultrusion-winding process, and tested under unidirectional tensile load to verify the validity of proposed tensile constitutive model. The outcomes have indicated that the proposed tensile constitutive model is in good agreement with the experimental results.