Magnesium phosphate cement-based materials were prepared using sea sand and sea water, then curing under nature and sea water in the marine climate and environment. Through test and analysis of strength properties, microstructure and composition of the materials,the long-term strength development, anti-sea erosion properties and microscopic mechanism of the materials were researched. The results show that: the sea sand and sea water have little effect on the mechanical properties of the materials, the materials have good long-term strength development, the compressive strength of the material hydrating for 7 d curing under the nature is more than 43 MPa, the compressive strength of the material hydrating for 900 d curing under the nature is about 90 MPa. The marine magnesium phosphate cement-based materials have good anti-sea erosion performance, the compressive strength of the magnesium phosphate cement mortar hydrating for 900 d curing under seawater is 37. 9 MPa. The relationship between microscopic composition and macroscopic properties of the materials were established initially, accordingly lay a theoretical foundation for further improving the application features of the materials.%将采用海砂、海水制备的海工磷酸镁水泥基材料,分别在海洋气候环境下自然养护和海水中浸泡养护,通过对材料强度特性、微观结构及组成的测试分析,研究材料的长期强度发展规律、抗海水侵蚀性能及其微观作用机理.结果表明:海工磷酸镁水泥基材料的力学性能受海砂、海水的影响不大,材料长期强度发展较好,自然养护下材料7d的抗压强度达到43MPa以上,900 d的抗压强度达到90MPa左右；海工磷酸镁水泥基材料抗海水侵蚀性能较好,海水浸泡养护900 d时抗压强度达到37.9 MPa;初步建立了材料微观组成结构与宏观特性的关系,为进一步提高材料应用特性打下理论基础.
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