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通过反相悬浮聚合法制备了三聚氰胺甲醛（ MF）树脂微胶囊包覆红磷，采用红外光谱（ FI-IR）、扫描电子显微镜（SEM）、X-射线光电子能谱（XPS）对其结构进行了表征，并对微胶囊红磷与聚丙烯（PP）及尼龙6（PA6）形成的复合物的极限氧指数进行了分析，评价了微胶囊红磷的热性能，测试了其在PP及PA6复合物中的阻燃效率．实验结果表明，三聚氰胺甲醛树脂被成功包覆在红磷颗粒的表面．当微胶囊红磷的添加质量分数为15％时，PA6／MRP的极限氧指数LOI大于28．2％，而PP／MRP的极限氧指数LOI大于22．4％．“,”Microencapsulated red phosphorus( MRP) was prepared through inverse suspension poly-merization of melamine and formaldehyde ( MF) on the surface of red phosphorus ( RP) powder, and its structure was characterized by Fourier transform infrared ( FT-IR) spectroscopy, scanning electron mi-croscopy (SEM), and X-ray photoelectron spectroscopy (XPS).The limiting oxygen index (LOI) for MRP composites with polypropylene ( PP) or polyamide 6 ( PA6) was measured.The thermal property of microencapsulated red phosphorus ( MRP) was evaluated and the fire retardant efficiency was tested in PP and PA6 matrix.Experimental results from IR, SEM and XPS confirmed the coating of MF resin onto the surface of RP powder.In the flame retardancy of PA6 and PP, the experimental results showed that the flame retarded PA6 had the LOI>28 .2%when the loading of microencapsulated red phosphorus was 15 wt%, and the flame retarded PP had the LOI >22 .4% when the loading of microencapsulated red phosphorus was 15wt%.