近几十年来,学习者投入(Learner Engagement)得到了越来越多学者的关注。作为预测学生学业成就的重要指标,其在二语学习过程中的意义重大。本文梳理介绍学习者投入的概念、理论基础、研究方法以及相关研究成果,指出以往研究的不足和未来研究的方向,以期推动相关研究的进一步发展。In recent decades, Learner Engagement has received increasing attention from scholars. As a crucial indicator for predicting students’ academic achievement, it holds significant value in the process of second language learning. This paper provides an overview of the concept of Learner Engagement, its theoretical foundation, research methods, and related research findings. It also points out the limitations of previous research and the directions for future studies, to promote further development in related research.