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The purpose of this research is to propose architectural planning methods for rainwater usage by applying ‘Biomimcry’, the imitation of lessons learned from nature. Rainwater usage related case studies that show biomimetic properties were analyzed and methods that activated the architecture were examined. This research has been carried out through the following process. First, the outline of case study analysis was formed based on theoretical studies related to biomimcry and rainwater usage, and research on how water is being utilized in nature. The total of 27 rainwater usage case studies demonstrated the implementation of rainwater during the initial stage of architectural planning. The properties of biomimetic application were analyzed, and cases were classified by evaluating the relevance of biomimetic qualities. Moreover, each case was examined on how biomimetic properties are applied in order to suggest a direction on applying biomimicry methods for rainwater usage planning in buildings in the future. Suggested biomimicry methods can be divided into macro and micro levels based on the range of application and the scale of applied mechanisms learned from nature. The result of this study will help architects who are interested in getting ideas or guidance for planning buildings that use rainwater.