In this study, we attempted to toughen Polyamide 6 (PA6) by addition low molecular weight polyethylene (LMWPE) instead of rubber or elastomer. First, in order to investigate the relationship between dispersion state and toughness, a plurality of melt kneading methods such as single screw melt compounding, 8-axis screw melt kneading process and high-shear rotational processing were utilized. As a result, LMWPE was uniformly and finely dispersed using 8-axis melt kneading process. On the other hand, LMWPE aggregates were not observed in high-shear rotational processing. In the result of three-point bending test, PA6 was brittle fractured, but ductility of PA6/PE blend was shown by adding a small amount of LMWPE. The displacement of fracture was also greatly improved. In the comparison by the melt kneading process, it was possible to toughen PA6 with 8-axis screws melt kneaded products at the smallest addition amount (ca. 2 wt%). As observation results of the cross-sectional view during the bending test, it was confirmed that voids were formed from the LMWPE. By adding a LMWPE with low strength, the formation of voids was induced with low stress, and bending toughness could be improved.