本研究旨在探討高中英文教師對於英文作文教學的信念與其實際教學情形。文獻回顧內容涵蓋英文作文教學理論以及教師信念與實踐。 本研究的對象為台北市的高中英文教師，研究方法採用量化的教師問卷輔以質化的教師訪談，問卷回收171份，採用兩種統計方法分析：描述性統計及單因子變異數分析；訪談人數為6人，訪談結果用來支持、解釋問卷結果。研究重點如下：(一)教師信念及教學情形：包含教學目標、教師角色、教學內容及教學方式、（二）教師信念與實踐的符合度與造成不相符合的原因以及（三）影響教師信念與實踐的因素。 本研究的主要發現如下： 1. 大考會左右老師的教學方向，但老師教學時目標不只侷限於此。 2. 老師的教學信念與實踐皆綜合成果導向與過程導向的教學法原則，而非單一教學法。 3. 教師教學上面臨課程、學生、教學準備及批閱作文等方面的困難，這些困難會阻礙老師遵循其信念教學。 4. 教師背景經驗確實會對其信念與實踐有所影響。 本研究有助於認識高中英文教師教寫作的信念與教學情形。研究者根據研究發現，分別對高中英文教師、教師培育機構、教育部及作文教學教材編寫者提出建議，以期讓高中英文作文教學更進一步。 / The purpose of this study was to explore what beliefs senior high school English teachers hold toward writing instruction and their practices of the beliefs. Literature review covered the approaches of ESL/EFL writing instruction and teachers’ beliefs and practices. The participants of this study were senior high school English teachers in Taipei city. Two data collection instruments were adopted, the quantitative questionnaire and the qualitative interview. In total, 171 questionnaires were gathered and analyzed by means of descriptive statistics and one-way ANOVA. In addition, six interviews were conducted, whose results were utilized to further support and explain the questionnaire results. There were three research focuses. The first one was on teachers’ beliefs and practices in the goals of writing instruction, the roles they played, and the content as well as the teaching procedures of writing instruction. The second one was on the consistency between teachers’ beliefs and practices and possible reasons for the inconsistency. The third one was on influential factors on teachers’ beliefs and practices. Based on the results of this study, major findings are summarized. First, for the teachers in this study, entrance exams were approaching, so the test-oriented trend seemed to be inevitable. However, teachers believed that to familiarize students with English writing structure and to enable them to express in written English could also be possible goals, and they did teach accordingly. Second, the goals, roles teachers played, content, and teaching procedures reflected a mixture of product-oriented and process-oriented approaches. Third, the difficulties originating from curriculum, students, teaching preparation, and composition evaluation might hinder teachers’ practices of their beliefs. Finally, teachers’ background experiences were found to play a part in influencing teachers’ beliefs and practices. It is hoped that this study can contribute to more understanding of senior high school English teachers’ beliefs and practices in writing instruction. With the results of this study in mind, the researcher further made suggestions toward senior high school English teachers, teacher education institutes, the Ministry of Education, and writing instruction material designers. This might help refine senior high school English writing instruction.