Abstract: Attempts have been made is this paper to determine feasibility of Brahmaputra River sand reinforced by Coconut coir mat in terms of CBR values under soaked and unsoaked conditions in the laboratory for road construction purposes. Coir mats were placed at different depths from top of the mould and CBR values were obtained. CBR values are also determined using different mould-plunger ratios to know the effect of lateral confinement. Further settlement pattern of the same is studied by loading and unloading tests for one cycle only.