Maleic anhydride-styrene-acrylonitrile copolymer(SAM) was used as compatibilizer to prepare PA6/ABS blends.Maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer(ABS-g-MA) was used to toughen and compatibilize PA6/ABS blends.The results show that ABS disperses in PA6 matrix uniformly for the two kinds of blends.When the thickness of the samples is 6.35 mm,PA6/ABS-g-MA blends show obvious brittle-ductile transition,however,PA6/ABS/SAM blends break in brittle way.As for the samples with the thickness of 3.18mm,a obvious brittle-ductile transition takes place for the two kinds of blends.Vu-Khanh tests show that PA6/ABS-g-MA blends behave much higher Gi and Ta values,which indicates PA6/ABS-g-MA blends have much higher impact toughness.