Ethylene acrylate, butadiene acrylate, acylonitril and grafted natural rubber (NR-g-EA-BA-AN-VAC) was proceeded by using emulsion polymerization with potassium persulfate and sodium hydrogen sulfite as redox initiation system. Effects of technical conditions such as reaction time, reaction temperature, initiator concentration and monomers concentration on graft polymerization were investigated. Results showed the optimum polymerization conditions were as follows: reaction temperature 60-70 degree C, initiator concentration 1.3 per cent, and reaction time 3 hours. In addition, the morphology and properties of NR-g-EA-BA-AN-VAC (NA) graft copolymer were investigated by IR, TEM, DSC and determination of mechanical and physical properties. IR spectra confirmed the formation of NA graft copolymer. TEM and DSC showed that NA was really a heterogeneous system. And in comparison with NR, oil resistance and aging resistance of NA increased greatly.