Abstract: PA6 / ABS blends were prepared by blending PA6 (polyamide 6) and ABS (acrylonitrile-butadiene-styrene) resins. The effect of the amount of ABS resins on the properties of PA6/ABS blends was investigated. And different of rubber content in ABS/SAN blends were prepared in situ by blending SAN resins (acrylonitrile-styrene copolymer) and ABS graft copolymer. The effect of rubber content in ABS/SAN blends on the properties of PA6/ABS blends was investigated. SAM resins (styrene -acrylonitrile-maleic anhydride copolymer) were introduced into the blends to replace part of the SAN resins. The effect of SAM resins content on the properties of blends was investigated. The results indicated that the blends with 50 wt%-60 wt% ABS resins showed optimum properties. The tensile strength, elastic modulus, bending strength and bending modulus of blends decreased with the increment of rubber content in ABS/SAN blends. Tensile and bending performance of blends first decreased, then increased with the increment of SAM resins content in SAN resins. But the melt flow rates of blends decreased with the increment of SAM resins content. Difference of blending sequence with SAM resins showed little effect on mechanical properties of blends.