Teacher cognition has been an important agenda of language teacher education in recent decades, and it has advanced the field's understanding of L2 teachers' work. Thus far, language teacher cognition has been understood from different epistemological perspectives and researched with different methodological approaches. Given that teacher cognition is social and situational, more research is needed from an emic perspective to understand how teachers develop and renew their cognitions in their professional context. This paper adopts a discursive psychological perspective on teacher cognition, investigating novice teacher cognition using applied conversation analysis. As part of a more extensive study, the study offers an in-depth analysis of novice Chinese EFL teachers' thinking, knowing, understanding, conceptualising, and stance-taking regarding language teaching. The teachers were recruited through a combination of convenience and snowball sampling strategies. The dataset includes 330 minutes of classroom teaching, 217 minutes of interviews, and 605 minutes of video-based guided reflection on teaching. The data revealed the key theme in teachers' understanding of 1) focusing on linguistic knowledge, 2) establishing teacher authority, and 3) developing practical pedagogical knowledge. The findings reveal teachers' moment-by-moment cognition-in-interaction and multiple roles in facilitating learning. Substantial implications are put forward for teacher learning and teacher education.