Abstract: Reverse microemulsion system was made via employing an aqueous solution of FeSO4·7H2O as dispersed phase （water phase）， cyclohexane as continuous phase（oil phase），acrylamide（AM），and methyl methacrylate（MMA） as monomers，octyl phenyl poly（ethylene oxide）-10 （OP-10） as emolsifier，as well as ammonium persulfate （APS） as initiator.The system reaction has been initiated by heating to prepare magnetic γ-Fe2O3/P（MMA-AM） nanocomposites.The products were characterized by X-ray powder diffraction（XRD），transmission electron microscope（TEM），Fourier transform infrared spectroscopy（FT－IR），and thermogravimetric analysis（TGA）.Results showed that copolymer occurred from the MMA monomer and AM；γ-Fe2O3 particles dispersed in high molecular polymers，then the product was γ-Fe2O3/P（MMA-AM）.The optimum conditions for synthesizing magnetic γ-Fe2O3/P（MMA-AM）nanocomposites were as follows: oil to water volume ratio was 1∶3，c（Fe2+）=0.4 mol/L，and monomer content was 7% （mass fraction）.

Key words: &gamma, -Fe2O3；reverse microemulsion method；nanocomposite；magnetism