语言生活涉及社会生活的方方面面,是社会生活的重要组成部分。不同的社会因素导致语言的变化,这是语言变化的外部机制。三线建设是我国社会发展进程中一次重大的社会变革,“分散、隐蔽、靠山”是当时国家对三线建设选址的原则,为此三线建设的时代特殊性和企业的封闭性导致西部山区形成了 Language life involves all aspects of social life and is an important part of social life. Different social factors lead to the change of language, which is the external mechanism of language change. The construction of the third line is a major social change in the process of social development in our country. “Dispersal, covert and backing ” is the principle that the country selected the construction of the third-line at that time. Therefore, the particularity of the third-line construction and the closeness of the enterprise led to the western mountainous area formed