本研究基于活动理论视角，采用质性研究的方式对一位以苗语为母语、汉语为交际语、英语为第三语言的苗族中学英语教师进行叙事研究。结果研究如下：语言认同具有阶段性、情境性和矛盾性特征；语言认同存在认同危机，其消解途径为持有积极发展意识的主体、有效的中介工具、执行严格的规范、建构积极的实践共同体及实施正面的社会分工。

Based on the perspective of activity theory, this paper employs a qualitative approach to investigate a Miao English teacher with Miao Language as native language, Chinese as communicative language and English as the third language, to explore the characteristics and crisis of linguistic identity, as well as the way to eliminate the crisis. The results indicate that: (1) the stages, situations and contradictions are the three characteristics of linguistic identity; (2) there is a crisis of identity in linguistic identity; (3) the ways to eliminate the crisis of linguistic identity need to meet the five aspects, including the main body who with self-promoting consciousness, the effective intermediary tools, the positive community of practice, the strict norms and the positive social division of labor.