Abstract: Two standards are usually adopted in impact test of nuclear power engineering in China:GB/T 229-2007 and ASTM E23-2007a. Taking SA-508Gr.3Cl.1 steel and SA-182F316LN steel commonly used in nuclear power engineering as research objects, the differences between the two standards were compared and analyzed from two aspects:impact absorption energy and ductile-brittle transition temperature. The results show that GB/T 229-2007 was more stringent. The impact absorption energy measured by this standard was lower than that measured by ASTM E23-2007a. When the test temperature of SA-508Gr.3Cl.1 steel was higher than the ductile-brittle transition temperature, the difference of impact absorption power measured by the two standards increased with the increase of temperature, and when the temperature was lower than the ductile-brittle transition temperature, the impact absorption power measured by the two standards was close. The impact absorption energy of SA-182F316LN steel measured by ASTM E23-2007a was higher than that measured by GB/T 229-2007 in the test temperature range, and the difference between them was the greatest at -80℃. It is suggested that GB/T 229-2007 should be gradually used to evaluate the impact performance of nuclear power materials on the basis of fully accumulating impact performance data of nuclear power engineering materials.