Abstract: Anxiety is one of the most important emotional factors in language learning. Classroom teaching plays an important role in the teacher-student conversational mode in the process of learning a foreign language, while the students' output production in the classroom discourse is a measure of foreign language classroom interaction between teachers and students. The paper analyzes students' output production anxieties in foreign language classroom by using FLCAS, teachers' observations, students' reflective journals and interviews as the instruments for quantitative study. It argues that the source of anxiety is closely related to the teachers' role, the students' personal factors and the teaching context, in order to enlighten foreign language teaching and learning.