This article takes Maolin district in Kaohsiung for instance to discuss the emergence of ecotourism under the contemporary trends of sustainable development, and to treat the relationship between the protection of biodiversity and local communities. Moreover, I will consider knowledge and practices concerning nature and the universe within intangible cultural heritage, and analyze symbolically the image construction of the valley of purple butterflies. With the impact of outside environment, cultures approach similarity. At this time, the community resignalizes its boundaries by symbols. The boundaries are symbolic, and the individuals of the same community have different interpretations for them. The different languages, rituals and traditional knowledge of Sha-San-She Rukai are the representation of symbolic boundaries. The communities express their identities through these intangible cultural heritage. Give the purple crow butterfly as an example, Teldreka has different cognition and interpretation of butterflies from west Rukai and Paiwan.