Abstract: In order to better understand and apply the requirements for ultrasonic testing of steel forgings of nuclear component in accordance with RCC-M edition 2007, FM 1061 and the relevant standards, this paper makes particular comparison and analysis of examination process and acceptance criteria between different codes and standards. Combined with the engineering practice, this paper aims to present recommendations on ultrasonic testing designing for examination of forgings with drill holes during manufacturing, for examination of type 4 forgings, for examination of near surface defects of forgings, and for application of DAC method of angle beam examination and associated acceptance criteria for low alloy steel forgings of nuclear primary component, respectively. It may provide reference for ultrasonic testing designing,procurement and manufacturing of forgings for nuclear components according to RCC-M code.