A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolie resin．The reaction between NBENP and resol was measured by FT-IR．and the curing behavior of resins was charactered by DSC．The mecanical and thermal properties of modified resins were measured．Fracture surface of modified phenolic resin was observed by SEM The resuhs showed that

the impact strength

flexural strength and heat resistance of NBENP modified phenolic resin were increased at the same time A strong interface adhesion was formed because of the reaction between hydroxymethyl of resol and NBENP．This special interface conduces to transmission of stress when materials were loaded

and inhibition of deformation and decomposition of phenolic matrix when heated．The microcrack．initiated with rubber particle

and cavitation of rubbers might be the main reason for increase in tollghness．The honeycomb structure in fracture surface might be another possible reason for excellent mechanical properties．