The effects of Ethylene-Vinyl Acetate copolymer （EVA） latex as an additive or a glass fiber surface 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. However, excessive EVA interfered with the growth of the 5Mg（OH）2·MgCl2·8H2O crystal and the properties of GF/MOC composites.
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