“没事”在现代汉语口语中兼具字面动宾短语与多功能应答类话语标记两种属性，是对外汉语口语教学中的高频习得难点。当前对外汉语课堂对该表达的讲解多存在简化处理问题，留学生常出现功能使用单一、语境匹配失当、语用应答误用等偏误。本文以“没事”为研究对象，从句法、语义、语用三维度厘清其多层含义与交际功能；结合课堂教学观察与留学生语料，归纳典型偏误类型并分析成因，据此提出分层递进教学、实景情景创设、汉外对比辨析、真实口语语料输入等针对性教学策略。本研究完善了汉语口语语块的多功能话语标记本体研究，可为国际中文口语课堂提供可落地的教学方案，对提升汉语学习者的语用意识与跨文化交际能力具有实践参考价值。

The Chinese expression “méi shì” (literally “no matter”) possesses dual properties in modern spoken Chinese: it functions both as a literal verb-object phrase and a multi-functional responsive discourse marker, making it a frequently encountered acquisition difficulty in oral Chinese teaching for international learners. At present, explanations of this expression in oral Chinese classes tend to be oversimplified, which often leads international students to commit pragmatic errors including limited functional application, inappropriate contextual matching and misuse in conversational responses.Taking “méi shì” as its research subject, this paper clarifies its multi-layered meanings and communicative functions from three dimensions: syntax, semantics and pragmatics. Based on classroom teaching observations and corpus collected from international learners, it categorizes typical acquisition errors and analyzes their root causes. Targeted teaching strategies are accordingly proposed, including progressive hierarchical teaching, real-life situational design, Chinese-foreign contrastive analysis and input of authentic spoken Chinese corpus.This research enriches ontological studies on multi-functional discourse markers among colloquial Chinese chunks. It provides practical, implementable teaching schemes for oral international Chinese classrooms, and carries practical reference value for improving Chinese learners’ pragmatic awareness and cross-cultural communicative competence.