English as an international common language occupies an important place in the Chinese education system, but the oral English teaching in Chinese basic education stage (from grade 3 to grade 6) is not fully implemented. Traditional way of oral English teaching, such as listening to audio recording and reading English dialogue, leads primary school students to negatively engage in classroom teaching, resulting in the poor success of oral English teaching. The purposes of this study were to design an App-based oral English teaching model to guide oral English teaching and to evaluate this teaching model in one Chinese primary school in Lizhou Area of Guangyuan City, Sichuan Province, in order to see this new way of teaching was possible in this context. This study investigated student engagement in three aspects: behavioral engagement, cognitive engagement and emotional engagement in order to ascertain whether students actively engage in oral English class teaching guided by the proposed teaching model. The results revealed that overall the students had a positive engagement in the classroom teaching with the guidance of the App-based oral English teaching model. Hence, it can be concluded that the proposed teaching model could provide guidance for a more engaging oral English teaching, and allowed English teachers to design oral English classes with App to help improve students’ classroom engagement.