普通话推广有助于改善地区经济发展水平、促进社会经济持续进步，也是精神扶贫的一种重要途径。当前，推普政策已实施多年，但城乡差距大、民族地区普及范围不够广等问题仍然存在，在这一领域的研究也主要集中在语言与劳动力收入的相关关系上，对于普通话水平对收入的影响机制研究较少。本文基于云南省丽江市宁蒗县低学历外出务工人员的调研所得数据，应用改进的Mincer人力资本模型、多元线性回归、有调节的中介效应模型，通过定量分析探究低学历劳动者普通话水平对收入的影响机制。研究发现，普通话水平的提升能够促进收入水平的提升。当引入社会融入作为中介变量时，普通话水平对收入的提升不仅有直接的促进作用，更可以通过增进外出务工者的社会融入情况进而促进收入提升。对于调节效应，分析得出外出务工者的情绪智力水平对普通话程度→社会融入这一路径具有正向的影响，而对于普通话程度→收入这一直接作用影响不显著。

The popularization of Mandarin helps to improve the level of regional economic development and promote the continuous progress of social economy. And it is also an important way of spiritual poverty alleviation. At present, the popularization policy has been implemented for many years, but there are still some problems, such as the big gap between urban and rural areas, the lack of popularization in minority areas. The research in this field also focuses on the relationship between language and labor income, but there is little research on the influence mechanism of Mandarin level on income. Based on the survey data of migrant workers with low educational background in Ninglang, Lijiang, Yunnan, this paper applies the improved Mincer human capital model, multiple linear regression and moderated mediating effect model to explore the mechanism of Mandarin level on income of workers with low educational background through quantitative analysis. The research found that the improvement of Mandarin level can promote the improvement of income level. When social integration is the intermediary variable, the improvement of Mandarin level can not only promote the improvement of income level directly, but also promote the improvement of income level by raising their social integration level. With regard to moderating effect, the results show that migrant workers’ emotional intelligence has positive impact on the path of Mandarin level →social integration, but has no significant influence on the direct effect of Mandarin level → income

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