Abstract: ：Microcapsulation has been an important method for flame retardant modification. Firstly，the development of microcapsule flame retardants and their advantages over the traditional ones are reviewed. Then，new researches on the shell material of microcapsule flame retardant，processing of flame retardant microcapsulation and their new applications are presented. Finally，the new technologies of interfacial polymerization and in-situ polymerization，and three new methods in microcapsulation of flame retardants：sol-gel，evaporation of solvent，and supercritical fluid-rapid expansion of supercritical solutions，are introduced.