 This paper compares the tensile strength, elastic modulus, and hardness of basalt and e-glass fibres used in FRP composites through fibre tensile testing, nanoindentation, XRD, and FTR spectroscopy. The results show that basalt fibres have higher mechanical properties than e-glass fibres due to their higher density and iron content, which forms Fe3 plus in the glass network and improves the properties. This article was authored by Jinshu and Liu, Meiyong Chen, Jianping Yang, and others.