在课堂上，有的学生不敢主动回答问题，更不敢站到同学面前讲话或演讲，他们一见到老师询问的目光就紧张地躲闪，若被提问到，要么一言不发，要么简单地用“不知道”来作答。本文在分析这种后天性表达障碍形成原因的基础上，提出消除学生表达障碍的对策。一、后天性表达障碍形 In class, some students are afraid to take the initiative to answer questions, but can not stand in front of classmates speech or speech, they saw the teacher asked to look at the eyes dodge nervously, if asked, either without a word, or simply To use “do not know” to answer. Based on the analysis of the causes of the acquired obstacles, this paper proposes the countermeasures to eliminate the obstacles of students' expression. First, the expression of acquired obstacles