依客家基本法第六條訂頒「國家客家發展計畫」，要求政府各機關推動族群主流化。客家委員會以族群主流化為論述，視「福佬客」用語具歧視性，正名為「客底」，推動客底政策。本文從多元文化主義、平等原則出發，再演繹族群主流化理論，並討論客底政策，獲致：（1）為拓展族群主流化理論框架，宜從「實質平等為中心的族群主流化」，轉化為「多元、公平、包容為中心的族群主流化」。（2）客底政策的特徵包含福佬客正名為客底、建構新的政策工具、從客語復振轉向為追溯客家血緣、形塑或深化客底的客家認同等。（3）以客底政策反饋於族群主流化理論，反思客家政策新思路為「包容閩南裔的客底」、「研擬雙族裔或多族裔認同的制度」。

According to Article 6 of the Hakka Basic Act, the “National Hakka Development Plan” was promulgated, requiring all government agencies to promote ethnic mainstreaming. The Hakka Affairs Council, invoking ethnic mainstreaming as its rationale, has deemed the term “Hokloized Hakka” to be discriminatory and replaced it with “Hagdai,” thereby promoting the Hagdai policy. Drawing on the principles of multiculturalism and equality, this study further elaborates on the theory of ethnic mainstreaming and examines the Hagdai policy, reaching the following conclusions: (1) To expand the theoretical framework of ethnic mainstreaming, it is advisable to shift from an approach centered on substantive equality to one centered on diversity, equity, and inclusion. (2) The Hagdai policy is characterized by the renaming of Hokloized Hakka as Hagdai, the development of new policy instruments, a shift from Hakka language revitalization to the tracing of Hakka ancestry, and the shaping or deepening of Hakka identity among Hagdai. (3) Reflecting on ethnic mainstreaming theory, this study suggests that emerging directions for Hakka policy should include the inclusion of Hakka individuals who speak Hoklo and the development of a dual-ethnic or multi-ethnic identity framework.