In this article, the deformation properties of textile structural composites obtained by the Tap-Laying process are studied experimentally. The reinforcement or prepreg must be performed to the desired shape during manufacture. Mechanical behavior plays an important role in this process. However, this thermoforming process is generally carried out at high temperatures, and the mechanical behavior can be altered in this state. In this paper, the thermomechanical properties of flax/polyamide 12 (PA12) blended yarns and prefabricated parts obtained by the Tap-laying process were analyzed through in-plane tensile and bending tests at different temperatures. The results show that increasing the temperature below the melting point of PA12 improves the strength of the fabric. In addition, adjusting the different layers of tape can enhance the strength of the prepreg components. This suggests that the fluidity of PA12 has a significant effect on the tensile and flexural properties.