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The effects of Ethylene- Vinyl Acetate copolymer ( EVA ) latex as an additive or a glass fiber sur face modifier on the properties of Glass- Fiber ( GF ) / Magnesium Oxychloride Cement ( MOC ) composites was studied.The mechanical properties, water resistance and aging resistance of the cured GF/ MOC composites were estimated and chemical ingredients analysis and morphological study of the GF/ MOC composites were also performed.It is found that EVA added to the MOC matrix could substantially improve the interfacial adhesion, water resistance and aging resistance of GF / MOC composites.EVA treatment on glass fibers resulted in decreasing initial flexural strength of GF/ MOC composites while enhancing the soft coefficients.In addition, the drying time and dilution of the EVA treatment on glass fibers also had an obvious effect on the properties of GF/ MOC composites.GF / MOC composites.