本研究之主要目的有二：一、檢驗客語沉浸教學介入的影響，包括「是否提升學童客語能力」及「客語沉浸教學介入是否對其他學科有負面影響」；二、瞭解客語沉浸教學的實施過程所遭遇的挑戰。研究者以屏東縣某國小一年級的兩班學生進行客語沉浸教學的實驗，一班（22人）為實驗組，有客語沉浸教學介入，教室中有50%以上的溝通以客語進行；另一班（21人）為對照組，沒有客語沉浸教學介入，教室中說的是國語。研究的設計是等組前後測的真實實驗設計，研究者蒐集介入前後的客語能力及各學科成績，以檢驗介入的影響。此外，研究者以觀察及教師訪談的方式，瞭解實務遭遇的挑戰。
研究結果發現：一、實驗組的客語基本能力、聽說能力及整體能力均有顯著提升，而且，以前測為共變數時，實驗組的進步幅度顯著超過對照組；二、實驗組和對照組的國語、數學及生活的成績並未有顯著差異。亦即，客語沉浸教學的介入有效，實驗組兒童客語能力各方面的成長超過了對照組；而且這樣的介入並未負向影響國語、數學、生活課程的學習。最後，本研究呈現客語沉浸教學實施時主要的挑戰，並提出未來推行國小一年級客語沉浸教學之建議。

The main purposes of this study are two-folded: (1) to examine the effectiveness of a Hakka language immersion program; Two research questions are: “Does the program effectively promote children’s Hakka language proficiency?” and, “Does the have negative influences on children’s academic performance?” (2) to understand the challenges faced by the immersion educators. An equivalent pretest-posttest true experimental design was adopted. Forty-three first graders were randomly assigned to the experimental group and control group, of which 22 and 21 students were composed respectively. The experimental group was educated in a Hakka language immersion environment in which more than 50% of communication was in Hakka, whereas the control group, just like other classrooms, spoke only official language, the Mandarin. To examine the program’s effectiveness, the data of children’s Hakka language proficiency and test scores of reading, math, and life curriculum, prior and after the intervention, were collected.
Research results show that: (1) According to the growth scores between preand post-tests, the Hakka basic ability, listening comprehension, and overall Hakka competence of experimental group were significantly improved. Furthermore, using the pretest scores as covariates, the improvements of experimental group outperformed the control group; (2) There were no significant differences on these mester final scores of mandarin, mathematics and life curriculum between the experimental group and control group. That is, the implementation of the Hakka language immersion program was effective and had no negative influence on the learning of other subject areas. Based on the observation and interviews, Researchers reported the challenges of implementing this program. Suggestions were also provided.