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ABSTRACT Magnesium alloys are potential materials for automobile and aerospace industries due to its light weight, high strength-to-weight ratio, good cast ability, low elastic modulus, good machine ability and wear resistance. Among various Mg alloys, Mg-Si alloy have great potential for high temperature and wear resistance applications because of its hard Mg2Si phase. Howeverthe mechanical properties of the hypereutectic Mg-Si alloys are not satisfactory because of coarse brittle dendritic Mg2Si intermetallic and coarse lamellar eutectic Mg2Si phases. In order to increase its mechanical properties various researches are undergoing. Among that addition of Lanthanum (La) is the one of the optimum way to modify the Mg2Si phase. In the present study deal with the addition of La in Mg-6Si is to be investigated. Different proportions of Lanthanum (La) 0, 0.3, 0.6 and 0.9wt % effect is proposed to investigate. In order to understand the microstructure of modified/unmodified Mg-6Si alloy with different La addition will be studied using optical microscope and SEM analysis. The formation of La containing precipitate and its modifying mechanisms and morphology changes in Mg-6Si alloys is also will be investigated through XRD, SEM and EDX analysis. The mechanical properties of improved microstructure of Mg-6Si alloy due to the La addition is analysed by subjecting to its tensile and hardness tests.