以2011~2023年中国A股上市公司为样本，从供应链的角度出发，探究客户数字技术创新对供应商企业人力资本升级的影响。研究发现，数字技术创新在供应链上具有传染效应，客户数字技术创新有助于推动供应商人力资本升级。进一步研究表明，提升供应商企业创新以及改善供应商债务融资是客户数字技术创新促进供应商人力资本升级的关键作用机制。异质性检验发现，当客户对供应商的重要性增加（如供应商高度依赖客户、行业竞争加剧），供应商属于高科技行业或者位于东部地区时，客户数字技术创新对供应商人力资本升级的正向影响更显著。此外，供应链共同机构投资者与客户数字技术创新在促进供应商人力资本升级方面存在替代作用。

Using Chinese A-share listed companies from 2011 to 2023 as the sample, this paper examines the effect of customer digital technology innovation on supplier firms’human capital upgrading from a supply chain perspective. The results show that digital technology innovation has a contagion effect across supply chains, and customer digital technology innovation promotes supplier human capital upgrading. Further analysis reveals that enhancing the innovation of supplier enterprises and improving supplier debt financing are the key mechanisms through which customer digital technology innovation facilitates supplier human capital upgrading. Heterogeneity tests indicate that the positive effect of customer digital technology innovation on supplier human capital upgrading is more pronounced when the customer’s importance to the supplier increases (e.g., high supplier dependence on the customer, intensified industry competition), the supplier operates in a high-tech industry, or is located in eastern China. Additionally, there is a substitution effect between common institutional investors in the supply chain and customer digital technology innovation in promoting supplier human capital upgrading.