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

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