文章针对大学生英语口语交际能力缺失这一现象,对“输入假说”、“输出假说”和“互动假说”的利弊进行了分析,并采用问卷法对英语专业和生物专业学生的口语习得情况进行了实证研究。调查结果显示,孤立看待其中任何一个理论都是错误的,习得者需要把语言输入和语言输出恰当的结合在一起,并在与别人的交流互动中习得外语。 This article analyzes the pros and cons of the “communicative hypothesis” of “input hypothesis”, “output hypothesis” and “interactive hypothesis” for the undergraduates’ lack of communicative competence in oral English and applies the questionnaire method to English majors and biology students Oral English Acquisition conducted an empirical study. The survey results show that it is wrong to treat any of these theories in isolation. The learner needs to properly combine the language input with the language output, and learn the foreign language in the interaction with others.