Abstract: Based on the data of Chinas manufacturing industry at the provincial level from 2011 to 2021， this paper empirically tests the overall effect， heterogeneity effect and intermediary mechanism of the development level of digital trade on the complexity of manufacturing exports. The research shows that digital trade significantly improves the complexity of manufacturing exports on the whole， and this effect is most significant for technologyintensive industries， but not for capitalintensive industries， and has an inhibitory effect on laborintensive industries. Regional heterogeneity analysis shows that digital trade in central and western regions has a greater effect on the complexity of manufacturing exports than that in eastern regions. The intermediary effect test shows that digital trade can improve the export complexity of manufacturing industry by promoting technological innovation and reducing trade cost， and both technological innovation and trade cost play a partial intermediary role. Based on the research conclusions， suggestions are put forward to increase the investment in digital technology R&D， strengthen the construction of digital trade infrastructure and improve the relevant policy support for digital trade.

Key words: digital trade; technical complexity of manufacturing export; technological innovation; trade costs; mechanism test

摘要： 基于2011—2021年中国制造业省级层面的数据，实证检验数字贸易发展水平影响制造业出口复杂度的总体作用、异质性影响和中介机制。研究表明，数字贸易总体上显著促进制造业出口复杂度提升，这一影响对技术密集型行业最为显著，对资本密集型行业不显著，对劳动密集型行业起到抑制作用。区域异质性分析发现，中西部地区的数字贸易对制造业出口复杂度的促进作用大于东部地区。中介效应检验发现，数字贸易通过促进技术创新、降低贸易成本影响制造业出口复杂度提升，且技术创新和贸易成本均发挥部分中介作用。基于研究结论，提出加大数字技术研发投入、加强数字贸易基础设施建设和完善数字贸易相关政策支持的建议。

关键词: 数字贸易；制造业出口技术复杂度；技术创新；贸易成本；机制检验