词汇附带习得指学习者在进行有意义的语言使用活动或学习任务时，其注意力并非在词汇上，却无意中增加了词汇知识，是一种注意力聚焦于其它活动时顺便出现的认知活动。本研究从二语词汇附带习得研究的源起、影响二语词汇附带习得的言内外因素、聚焦于形式以强化词汇附带习得效果的任务等方面对近 30 年国外第二语言词汇附带习得研究的发展进行述评，并从口语语篇、多模态话语和多词单位三个视角预测该领域的发展潜势。

Incidental vocabulary acquisition refers to the learning of vocabulary as a by-product of any activities not explicitly geared to lexical learning. This study summarizes and reviews the studies of incidental L2 vocabulary acquisition in the past three decades from the following aspects: its source, linguistic and nonlinguistic factors affecting incidental vocabulary acquisition, and Focus-on-Form tasks aiming to enhance incidental vocabulary acquisition. This article also makes predictions of future trends in this field from the perspectives of spoken discourse, multi-mode discourse and multi-lexical unit.