Combined with the precedence of listening in first language acquisition, this paper generates that listening is primary and speaking is secondary in second language acquisition by analyzing comprehensible input, comprehension approach and the process of simultaneous interpretation. 本文结合一语习得中听的第一性和说的第二性,通过分析克拉申的可理解输入、领悟法和同声传译过程,得出在二语习得中听也是第一性的。