Abstract: This paper adopts Bandura's "individual-environment-behavior" Triadic Reciprocal Causation and applies the grounded theory method to analyze the formation mechanism of pro-environmental behaviors among community residents in the Giant Panda National Park. The results show that external environmental factors (e.g., neighborhood relations, tourism development, social norms) affect individuals' psychological perceptions and significantly shape their subjective norms, place attachment, and perceived benefits. Under the combined effects of emotional bonds, rational trade-offs and value judgments, residents develop and engage in specific pro-environmental behaviors. Meanwhile, these pro-environmental behaviors in turn improve environmental quality and social climate, boost tourism attractiveness and community governance capacity, and form a positive feedback loop of "environment-cognition-behavior-environmental reshaping". This study reveals the three-dimensional interactive logic of pro-environmental behaviors in national park communities, advances the understanding of behavioral evolution mechanisms within complex social-ecological systems, and provides theoretical support and practical implications for optimizing national park governance and developing incentive mechanisms for residents' pro-environmental behaviors.