The Belt and Road Initiative, as public goods provided by China to the international community, requires institutional support for its effective supply, yet it cannot produce a significant body of influential hard law rules in the short term.International soft law is highly aligned with the Belt and Road Initiative in terms of both philosophy and normative demands, offering a new solution to the institutional challenges faced by the Initiative.Specific soft law mechanisms can be applied in the following areas: at the conceptual level of the Belt and Road Initiative, more soft law declarations and initiatives should be formulated; in the field of infrastructure development, an open coordination mechanism should be established, along with soft law norms that include unified technical standards; in the investment sector, soft law norms should be utilized to address gaps and shortcomings in existing hard law treaties, while leveraging the institutional advantages of soft law in facilitating multi-stakeholder participation to create more exchange platforms for non-state actors; in the trade sector, beyond using soft law to complement existing hard law treaties, it is also necessary to adopt soft law norms in sovereignty-sensitive areas or for countries that have not yet signed any bilateral or regional trade agreements with China, in order to promote trade cooperation first, with hard law treaties to be concluded when subsequent cooperation matures.