A novel potential flame-retarded polymeric material——olymer/inorganics nanocomposite is reviewed. The characteristics and preparation methods of this kind of material are briefly described. The flame retardancies of both PPgMA (polypropylene graft maleic anhydride) /LS (layered silicate) and PS/LS nanocomposites are summarized in detail, and the effects of structures of PS/LS nanocomposites on material´s flame retardancy are discussed.