Based on color psychology, this research develops an integrated brand color strategy aimed at promoting the upgrade of Sanya’s tourism brand image and enhancing its competitiveness. Through questionnaire surveys, it extracts users' color perceptions and emotional responses to Sanya’s natural and cultural elements, refining them into regional color genes. These genes are combined with tourist journey mapping to create scenario-based narratives, enabling the precise application of the color strategy across the entire tourism experience and achieving cultural adaptation. The strategy uses tropical natural tones to establish the functional and emotional foundation of the tourism app interface. By systematically applying color, it ensures a unified Sanya tourism brand image is conveyed from digital interaction to physical experience, thereby strengthening emotional connection and guiding user behavior. This study provides a scientific pathway for tourism destination brand upgrading. While enhancing visitor experience and emotional resonance and shaping a unified, distinctive brand image, it also offers a replicable practical paradigm for the high-quality development of tourism in China.