对于教学目标的分析和评价一直是教育教学研究的热点问题。在以往的教学目标研究中,较为常见的是对课堂教学目标的设置与表述、三维目标整合的研究,在合理区分教学目标的难度方面研究较少。美国玛扎诺博士研究团队通过对课堂教学的跟踪调查和研究,提出了根据目标的难度对目标进行分层设计的思想。本文以人教版高中化学选修四“原电池”这一课题为例,结合玛扎诺教学理论和三维目标的理念,详述设计不同难 Analysis and evaluation of teaching objectives has always been a hot issue in education and teaching research. In the past research on teaching objectives, it is quite common to set up and express classroom teaching goals. Research on the integration of three-dimensional goals has rarely been studied in terms of the difficulty of reasonably distinguishing teaching objectives. The research team of the United States Dr. Marzano made a follow-up investigation and study of classroom teaching and put forward the idea of ​​stratifying the goal according to the difficulty of the goal. In this paper, we take the topic of “Primary Battery” as an example, combining the teaching theory of Marzano and the concept of three-dimensional goal,