This paper presents the effects of glass fibres on the shear strength parameters of coarse sand. To study the effect, sand was mixed with three different glass fibre contents (0.5%, 1.0% and 1.5%) with three aspect ratios of 30.45 and 60. Series of direct shear test was carried out at in loosest density to study the behaviour of unreinforced and reinforced sand. After studying the results, it clearly showed that the shear stress at failure and angle of internal friction of sand increased with increased in fibres contents.