This study explores user preferences and requirements for marinethemed elements in furniture design, integrating biomimicry principles to propose user-centered design concepts and innovations. Methodologically, the research includes sample collection, competitive analysis, expert reviews, user interviews, literature review, survey questionnaires, and quantitative data analysis. The study first identifies design cases through systematic collection and random sampling, then extracts and organizes requirements via expert reviews and user interviews, structured using the KJ method into four secondary and 17 tertiary categories. A Kano-based questionnaire (Likert scale) is then applied to classify attributes, while Better–Worse coefficients and an ω- weight test are used to validate and prioritize requirement importance. Drawing on principles from furniture design, color psychology, materials science, and ergonomics, the study derives specific manifestations for each requirement and establishes a clear priority sequence across categories. The research identifies 2 Must-be quality (M), 4 Onedimensional quality(O), 6 attractive quality (A), and 5 indifferent quality (I). By combining Kano analysis with Better–Worse validation, the study not only provides empirical findings but also demonstrates a methodological contribution that enhances reproducibility. Overall, this study provides valuable guidance for enriching and refining existing theories on ocean-themed biomimetic furniture design.