<p>Frictional coefficient is one of the dominant factors for sand grains to control the mechanical behaviors of the granular soils. In this study, a friction weakening model is adopted to describe the negative impact of contact force on inter-particle frictional coefficient. A series of DEM simulations are conducted to investigate the influence of friction-weakening on granular soil behaviors with different void ratios. From macro-mechanical perspective, friction-weakening enhances the contraction for loose samples and attenuates dilation for dense samples. The effect of friction-weakening is more significant for samples under a higher confining pressure. From micro-mechanical perspective, samples with friction-weakening have a higher value of sliding contacts ratio and coordination number compared with samples with constant friction. During the shearing process, friction-weakening will reduce the fabric anisotropy of granular soils. At critical state, the difference of fabric anisotropy between samples with different friction model is mainly reflected in fabric anisotropy indicator in terms of tangential contact forces.</p>