Abstract: Based on the data from the Online Learning Survey of National Senior High School,this research systematically describe the situation of teacher-student interaction and student academic achievement changes of senior high school students in online teaching.The study uses the ordered multi-classification logistic regression model to analyze the impact of teacher-student interaction quality in online teaching on academic achievement changes.The results show that there is good quality of teacher-student interaction in online learning.The participation of teachers is higher,while the participation of students is relatively low.The level of teacher-student interaction in online teaching is higher for female students,urban registered students and children from high socioeconomic status families.Further research shows that the improvement of teacher-student interaction in online teaching can significantly improve the academic achievements of senior high school students.

Key words: senior high school, online teaching, teacher-student interaction, academic achievement