Integrated Modular Avionics (IMA) system may load different kinds of software to a general hardware resource platform for realizing different functions, which brings about a high requirement to reconfiguration of the software components. The existing certification technology is unable to evaluate the safety of the reusable software components. In this paper, the certification requirements of the reusable software components are analyzed, and the validation elements and the evaluation requirements are given. This research can provide a theoretical support for the airworthiness certification of reusable software components.