课堂教学是教学的基本途径,也是学生获取信息,锻炼提高多种能力和养成一定思想观念的主要渠道。其有效性是教学目标落到实处,教学过程民主、科学、互动,教学主题知识和能力得到提高。本文从高中课堂教学的现状和实例,结合新课程下有效教学理念和看法,提出了新课程下课堂教学的有效性的问题,同时关注学生主体参与学习的广度 Classroom teaching is the basic way of teaching and it is also the main channel for students to acquire information, exercise various abilities and cultivate certain ideas and concepts. Its effectiveness is that the teaching goal is fulfilled, the teaching process of democracy, science, interaction and teaching subject knowledge and ability are improved. Based on the current situation and examples of classroom teaching in senior high schools and the effective teaching ideas and opinions under the new curriculum, this paper puts forward the problem of the effectiveness of classroom teaching under the new curriculum, and at the same time pays close attention to the breadth of students’ participation in learning