Abstract: To explore effective guidance for community residents' pro-environmental behaviors (PEB) in national parks, this study employs Bandura's Triadic Reciprocal Causation (individual-environment-behavior) as the theoretical framework and adopts the grounded theory method. Drawing on in-depth interviews with 70 residents from three typical communities in the Sichuan section of the Giant Panda National Park, it systematically analyzes the generation mechanism of residents' PEB. Results show that external environmental factors—neighborhood modeling, economic benefits, social norms, government-citizen interaction effectiveness, and ecological quality—significantly shape individuals' subjective norms, place attachment, and perceived benefits by influencing their psychological perceptions. Residents form and practice specific PEB through integrating emotional bonds, rational trade-offs, and value judgments. These behaviors further optimize environmental quality and social atmosphere, enhance tourism attractiveness and community governance efficiency, thus constructing a positive feedback loop of "environment-cognition-behavior-environmental reshaping". This study reveals the three-dimensional interactive logic of PEB in national park communities, broadens understanding of behavioral evolution mechanisms in complex social-ecological systems, and provides theoretical support and practical implications for optimizing national park governance and improving residents' PEB incentive mechanisms.