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For Mg-Li based composites reinforced with boride, besides improving the distribution and quantity of boride reinforced phase in composites, strengthening matrix is an effective way to improve performance of composites.Based on the research on the distribution and quantity of boride reinforced phase, the composite that contains 9% lithium and is composed of (Mg-9Li-1Al-1Y)-6B4C was prepared to make the performance of composites meet industrial applications' needs.