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The work center of school is teaching, and the work center of teaching is classroom teaching. In order to enhance the effectiveness and efficiency of classroom teaching, the teacher ought to know students' real-time learning state, the teacher should be interactive with students, and the teaching content should be vivid. But most of present classroom teaching has ordinary teaching effect, one reason is that the teacher can not know the students' real-time learning state and make adjustment accordingly. This paper proposes classroom teaching aids system based on wearable computing and centralized sensor network to solve above problems. Experiments prove that this system can enhance teacher's understanding of students' real-time learning state and improve teacher-student interaction.