Abstract
In second language acquisition (SLA) field, people gradually notice the influence of individual differences on language learning and ultimate attainment. The relationship between working memory capacity (WMC) and SLA has been analyzed from many perspectives. In this paper, we only focus on second language speaking rather than the whole SLA. Based on past studies, two research questions are designed in this paper. To answer the questions, Further researches need to pay more attention on this question.