Abstract: Series temperature Charpy impact test was done to three batches of samples (including low, medium and high impact energy levels) with 8 mm and 2 mm two kinds of pendulum striker radius to study the influence of pendulum striker radius on the impact absorbed energy, lateral expansion and percent of the shear fracture surface. The results show that there were obvious difference between the impact test results tested with different pendulum striker radius for all low, medium and high energy samples and the impact absorbed energy tested with 8 mm pendulum striker radius was higher than that tested with 2 mm pendulum striker radius. But the difference became smaller at the upper and lower platform. Meanwhile, the two impact ductility indexes, lateral expansion and percent of shear fracture surface tested with the two kinds of pendulum striker radius showed the same rule. The ductile-brittle transition temperature tested with the two kinds of pendulum striker radius was also different.