Magnesium phosphate cement(MPC) is a novel cementing material characterized by Early strength and fast hard. The present researches refer to the chemical composition, hydration mechanism, mechanic and repairing performance of MPC while seldom come to the water resistance. This paper compared the water resistance of MPC with different amount of aluminum salt, ferric salt, coal ash and outer waterproof agent. The results indicated that aluminum salt, ferric salt, coal ash and outer waterproof agent can all improve the water resistance of MPC in some extent. For instance, when the proportion of ferric salt was 0.50%, the strength retention of 90 d of MPC was 88.09%.when the proportion of ferric salt was 0.75%, the strength retention of 90d of MPC was 80.18%. It achieved cheerful effect about the water resistance of MPC. When the proportion of coal ash and increasing of the waterproof agent. It also improved the water resistance of MPC significantly. With the increasing of the waterproof agent, the compression strength of the solid MPC specimen is growing at the same time.%磷酸镁水泥(MPC)是一种早强快硬的新型胶凝材料.研究了不同掺量的铝盐、铁盐、粉煤灰以及外涂不同涂层防水剂对磷酸镁水泥耐水性能的影响.结果表明,90d时,铁盐掺量0.50％,强度保留率为88.09％,铝盐掺量0.75％,强度保留率为80.18％,与磷酸镁水泥基准组强度保留率56.50％相比,分别提高了31.59％和23.68％,说明对磷酸镁水泥耐水性改性效果较好；掺加粉煤灰以及外涂防水剂也能不同程度的改善磷酸镁水泥耐水性,且随着防水剂涂层的增加,MPC试件在水养条件下的抗压强度呈增长趋势.
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