The rising value of construction materials in many countries needs to research and implement of different alternative materials in civil engineering construction .The wastes can be used as aggregate in concrete for the production of light weight concrete. Amid this study, coconut shell is utilized as light-weight mix in concrete. The undertaking paper goes for examining split tensile strength, flexural strength and compressive strength characteristics with complete replacement of coarse combination with coconut shell with different proportions (15%, 30%, 45%)to supply light-weight concrete and to exchange cement by exploitation silica fume as admixtures with completely different percentages (0%, 10% &15%) to urge smart strength like standard concrete. Concrete cubes and cylinders are casted with mix proportion (1:1.79:3.17) and their mechanical properties are determined and compared with standard concrete.. The effective use of silica fumes for the improvement of strength of lightweight coconut shell concrete. The Maximum compressive strength at 28 days when 15% silica fumes& 15% coconut shell is added to the mix and the value obtained is 34.04MPa. The maximum split tensile strength at 28 days when coconut shell is 15% and silica fumes is 15% is added to the mix and the value is 2.98MPa.The maximum Flexural strength at 28 days when coconut shell is 15% and silica fumes is 15% is added to the mix and the value is 6.21MPa.