In global governance, the relationship between the United Nations (UN) and non?governmental organizations (NGOs) has evolved from a vertical, consultative arrangement to more flexible, inclusive, and pluralistic partnership models. Shifting power logic, institutional logic, and capacity logic have shaped the trajectory of this transformation and the patterns of cooperation among actors. Although UN-NGO cooperation has expanded from a singular structural mode toward more relational and normative forms, persistent challenges remain in terms of representation, efficiency, and accountability, underscoring the need to better coordinate the three logics to enhance governance effectiveness. As an emerging governance approach, collaborative governance has demonstrated advantages in coordination and mobilization within global climate governance practices. Focusing on UN-NGO interactions within the framework of the United Nations Framework Convention on Climate Change (UNFCCC), this study shows that collaborative governance has facilitated the integration of the three logics through institutional innovation, soft governance mechanisms, and network-based coordination. Adjusting and optimizing institutional pathways thus constitutes a critical entry point for achieving stable and effective cooperation between the United Nations and NGOs.