《普通高中化学课程标准》高一必修Ⅰ中关于离子反应这个知识点,由于对元素化合物知识的积淀不到位,加之这部分又是中学化学难点之一,所以学生感到比较抽象,理论性强,难以理解和掌握,教师也有“巧妇难为无米之炊”的感觉。但若是补充相关知识,拓展知识范围,既受课时所限,又会增加学生的负担,也很难收到成效。为此在教学中,笔者总结过去的教学经验,系统归纳,总结出“写好离子方程式的三步曲”的学习策略,它不仅 “General high school chemistry curriculum standards” high school compulsory Ⅰ on the ion reaction of this knowledge, due to the accumulation of knowledge of elemental compounds is not in place, combined with the part of high school chemistry is one of the difficulties, so students feel more abstract, strong theory, Difficult to understand and master, teachers also have “cleverness without straw” feeling. However, if we add relevant knowledge and expand the scope of our knowledge, we will not only be limited in class hours, but will also increase the burden on our students and will hardly yield results. To this end in teaching, the author summarizes the past teaching experience, systematically summarized, summed up “learning the trilogy of the ion equation ” learning strategy, it not only