当前学生错别字的“发病率”特别高,直接影响了语言表达的效果,对落实语言文字的训练起了一定的阻碍作用。因此努力帮助学生纠正错别字,势在必行。“阝”与“卩”作为小学生常混淆的部首,许多教师在教学的过程中虽然很重视,但很少在字理角度加以阐释。本文从汉字字理角度分析左耳刀、右耳刀、单耳刀的区别与联系。 The prevalence of “morbidity” in current students’ typos has a direct impact on the effect of language expression, which hinders the implementation of language training. Therefore, efforts to help students correct mistakes, it is imperative. Many teachers, although very often confused as primary schoolchildren, attach great importance to the teaching process, but seldom explain it in the orthodox sense. This article analyzes the differences and relations between the left ear knife, the right ear knife and the single ear knife from the perspective of Chinese characters.