“前后”、“左右”、“上下”是概数表达的手段之一,第二语言学习者不仅要学习理解他们的语义,还要辨别他们的使用规律。本文以前人研究的成果为基础,对例句的描写来进行概数“前后”、“左右”、“上下”的对比分析,并在此基础上进行偏误类型及对策的分析。 “Before and after ”, “around ”, “up and down ” is one of the means of expression, second language learners must not only learn to understand their semantics, but also to distinguish their usage patterns. Based on the results of the previous studies, this paper carries out comparative analysis of the “” before and after “, ” left and right “, ” up and down "on the description of the example sentences, and on this basis, the analysis of the types of errors and countermeasures .