In recent years, international standardization strategies have received increasing attention from countries and regions worldwide, and participating in the development of international standards is an important way to deepen the implementation of these standardization strategies. Considering the long cycle time and strict requirements of standard development, it is particularly key to select and cultivate proposals during the preliminary stage. Currently, the common mechanism for selecting international standard proposals mainly involves inviting technical experts in related fields to provide qualitative evaluation directly, which involves significant subjective factors and uncertainty. It is not conducive to effectively and sustainably developing new work item proposals, which will bring uncertainty risks to project approval and standard publication, and result in wastage of international labor and time costs. Therefore, it is necessary to establish a scientific, reasonable, objective, and reliable evaluation method for assessing the feasibility of new standard proposals. Based on the good practices and experience feedback of scientific research management, the research team discussed the main components of the evaluation criteria for international standard proposals. Taking the example of indicators such as the completeness of the proposal, its relationship with existing standards, and international recognition and wide participation building, a three-level index factor system was constructed to provide early input for the next-step quantitative evaluation. Meanwhile, the research team attempted to introduce the fuzzy mathematical concept into the management of international standardization projects in the nuclear field for the first time [1]. Based on the three-level evaluation index system, this paper proposes a fuzzy comprehensive evaluation method that is mainly applied to quantitatively evaluate the feasibility of the proposal. This method is based on this concept and uses the membership degree theory of fuzzy mathematics to convert qualitative evaluation into quantitative evaluation. Its aim is to provide a quantitative description for the experience judgment of standard relevant stakeholders. This method combines qualitative and quantitative analysis results to evaluate the potential degree of scientific and technological achievements being transformed into international standards, objectively, providing quantitative evaluation for key support projects in international standard R&Ds. It contributes to provide technical support continuously and effectively for the development of new standard proposals, and solidly promote the sharing and integration of global advanced technologies and good practices through standards.