文章以中国珠三角地区实地调查数据为例,分析社会资本对农民工整体的收入流动和群体内收入差距的影响机制与程度。研究发现:当前农民工群体呈现收入分化的趋势。从年度纵向上看,“整合型”社会资本无助于农民工整体收入的提高;“跨越型”社会资本能显著提高其收入。从农民工群体内部横向上看,“整合型”社会资本会显著减小农民工群体内的收入差距;“跨越型”社会资本则会显著拉大群体的收入差距,尤其对高收入组的收入增长贡献大于中低收入组。此外,研究还发现了教育对农民工收入差异的影响。在排除自选择因素和考虑潜在的内生性问题后,上述结论仍然成立。 Taking the field survey data in the Pearl River Delta of China as an example, the article analyzes the mechanism and extent of the impact of social capital on the overall income flow and the income gap among migrant workers. The study found that: current migrant workers groups show a trend of income differentiation. From an annual vertical perspective, the “integrated” social capital does not contribute to the overall increase of migrant workers’ income; and “cross-typed” social capital can significantly increase its revenue. From the horizontal perspective within the migrant workers group, “integrated ” social capital will significantly reduce the income gap within the migrant workers group; “across ” social capital will significantly widen the income gap between groups, especially for high Revenue groups contributed more revenue growth than low and middle income groups. In addition, the study also found that education on migrant workers income differences. The above conclusion still holds true after excluding self-selection factors and considering potential endogeneity issues.