According to Tsai theory, axial tensile experiments are carried out for basalt fiber-epoxy resin composite material (BFRP), with fiber volume fractions of 0.6%, 0.9%, 1.2% and 1.5%, and fiber orientation angle of 0°, 15°, 30° and 45°. The fiber sharing coefficient and the clustering fiber content are adopted to characterize the clustering effect of the basalt fiber in the epoxy resin, and to establish the micromechanics model and the geometry model of the clustering fiber. Meanwhile, the tensile strength of the BFRP is numerically calculated and compared.The results show that, when the fiber volume fraction is fixed, the BFRP tensile strength is decreased with the increase of the fiber orientation angle, and when the fiber orientation angle is fixed, the BFRP tensile strength is increased with the increase of the fiber volume fraction. The fiber sharing coefficient is decreased with the increase of the fiber vol-ume fraction, and the clustering fiber content is increased with the increase of the fiber volume fraction. The fiber clustering effect increases the BFRP critical fiber volume fraction as compared with the sharing one, and decreases the enhancement amplitude of the tensile strength of the basalt fiver in the epoxy resin substrate. The calculated values of the BFRP tensile strength with consideration of the fiber clustering effect are close to the experimental results.
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