This paper employs acupuncture as a case to explore how media texts act to organize a field of knowledge and practices on health in a post-colonial society where hybrid ideas and opposing views rooted from the East and the West merge. Acupuncture is conceptualized as socially built health knowledge that has become progressively lawful in media discourse. Through a mixed-method approach that rallies discourse and content analysis, 666 news articles linked to acupuncture issued in two Hong Kong newspapers over a 10-year period were explored. Three main forms of discursive legitimation construction – authorization, rationalization, and moral evaluation – were dinstinguished and developed in association with the texts and the social contexts. This inquiry discloses an intricate process of creating legitimacy for health knowledge via news narratives.