Student is the main subject of knowledge building, therefore, their behaviors in classroom can reflect the level of studying and the feature of teaching. The video can record the process of student engagement, which is the new method to study the classroo%学生是知识建构的主体，其课堂行为既能反映学生参与学习、知识建构的程度，同时也能体现教师教学的特点．课堂视频可以有效记录学生课堂参与的过程，是课堂教学研究的新途径．对初中数学课堂视频分析，发现初中生课堂参与行为有以下特点：学生应答行为发生最频繁；学生集体回答次数远多于学生独立应答次数；学生应答和课堂练习所占时间最长；在课堂练习阶段，学生的参与行为出现的次数最多；学生在课堂上极少提问．
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