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The intensification of heatwaves and extreme precipitation driven by climate change is escalating complex system risks across urban environments and society. Consequently, mainstreaming systemic climate resilience into overarching policy frameworks has emerged as a critical mandate for both national and local governments. While climate-resilient cities require the implementation of multi-layered adaptation strategies, structural limitations persist in decision-making processes—such as policy formulation and planning—due to the fragmentation of adaptation technology information and the absence of a standardized inventory. Therefore, this study develops an inventory-based decision support system to derive region-specific solutions, aiming to enhance decision-making utility for stakeholders and ensure long-term urban sustainability.To establish a scientific foundation for decision-making, an integrated technology-policy-effect framework was developed through a structured research process. First, a standardized classification system was established to create an exhaustive inventory of climate adaptation technologies and policies, identifying 58 policies and 61 unit technologies specifically related to heatwaves and flooding. Data objectivity and standardization were ensured through extensive domestic and international literature reviews, case studies, and expert consultations. These elements were subsequently consolidated into single information units through a systematic matching process and implemented as a user-centered interface. This provides a technical foundation for practitioners to empirically evaluate optimal alternatives based on scientific evidence.The system maximizes administrative efficiency by logically linking technological attributes, effects, and policy necessities within a standardized integrated inventory, enabling data-driven, region-specific adaptation measures. Upon its scheduled completion in December 2028, the system will serve as a foundational resource for the implementation management of national climate adaptation, urban planning, and disaster safety initiatives. Furthermore, it will provide quantitative evidence for diagnosing climate resilience through continuous monitoring. The outcomes of this study are expected to function as a global Reference Model, sharing Korea’s empirical experience and contributing to the collective global response to the climate crisis and the sustainable development of humanity.[Acknowledgement] This paper is based on the findings of the environmental technology development project for the new climate regime conducted by the Korea Environment Institute (2025-011(R)) and funded by the Korea Environmental Industry & Technology Institute (2022003570004).