研究旨在探討《O2O教育模式應用於國中補校英語教學之個案研究─以教育部英語線上學習平臺》為例，對國中補校學生英語學習成效及可行性。本研究採取行動研究法進行教學與觀察，以新北市立越界高級中學三年級36位學生做為研究對象。教學前、後測透過GEPT全民英檢網「全民英語能力分級檢定測驗-初級」了解學生進行O2O教育模式教學後是否有所差異；教學期間教材、教學現場紀錄、教學省思札記、錄影、訪談等多元方式觀察與紀錄學生協同學習的表現情形、參與態度以及師生的互動關係等，同時參考學生在校兩次段考成績分析《O2O教育模式應用於國中補校英語教學》教學結果，並針對教學過程、教學結果、晤談來分析《O2O教育模式應用於國中補校英語教學之個案研究─以教育部英語線上學習平臺》對國中補校學生英語學習成效及可行性，最後進行資料分析與討論。本研究結果可歸納下列四項結論： 一、Cool English線上學習平臺及教材內容適合個案研究補校學生程度。 二、O2O教育模式增加線下課程(offline)的學習效益。 三、O2O教育模式發現學習者學習動機更為強烈。 四、應用O2O教育模式在補校學生英語教學，可顯著提升學生學習成效。 / This study discusses subsidiary junior high school students’ English learning effect and feasibility via “A Case Study on the O2O Educational Model Applied to Subsidiary Junior High School’s English Teaching – by the Ministry of Education’s Online English Learning Platform.” In this study, teaching and observation were carried out by action research on the study objects of 36 third grade students of Yueh Chieh Senior High School in New Taipei City. Before and after teaching, the “General English Proficiency Test – Elementary Level” on the GEPT website was used to understand whether students are different after being taught by the O2O educational model. Multiple methods such as teaching materials during teaching, teaching scene records, teaching reflection notes, recording and interviews were used to observe and record students’ performances, participation attitudes, and interactions with teachers during collaborative learning. Two school exam scores of each student were also taken for reference to analyze the teaching results of the “O2O Educational Model Applied to Subsidiary Junior High School’s English Teaching.” Besides, the teaching processes, results and interviews were used to analyze subsidiary junior high school students’ English learning effect and feasibility via “A Case Study on the O2O Educational Model Applied to Subsidiary Junior High School’s English Teaching – by the Ministry of Education’s Online English Learning Platform.” Finally, data analysis and discussion were carried out. The study results were induced into four conclusions as follows: 1.The Cool English online learning platform and teaching materials suitable for a case study of subsidiary school students’ level. 2.O2O educational model increased offline's course's learning effect. 3.Via the O2O educational model, it found that learners have stronger learning motives. 4.Applying the O2O educational model to subsidiary school students’ learning significantly increased student’s learning effects.