Abstract: Articulated arm is widely used in Shanghai Synchrotron Radiation Facility(SSRF) for components’fiducialization with its portability and high accuracy. The design, actual technical method and quality assurance measures of fiducialization are addressed, while how to operate articulated arm correctly is stressed. When utilizing the arm, working efficiency is highly improved using its software’s study function. And measurement results with high accuracy are achieved through controlling tempera ture variation within 2℃ and comparing results between different apparatuses to monitor and amend systematic error.