Abstract: Based on the connotation of the digital economy and the concept of highquality development， an indicator evaluation system was constructed to evaluate the level of the digital economy and highquality development of foreign trade in 281 prefecturelevel cities in China from 2011 to 2019. The impact of the digital economy on highquality development of foreign trade was analyzed from the perspectives of cost reduction and innovation promotion. Additionally， it investigates the mediating effect of technological innovation and the spatial spillover effect of highquality foreign trade development. The results show:1）digital economy significantly promotes highquality foreign trade development， with technological innovation serving as a mediator; 2）digital economy plays a more obvious role in promoting highquality foreign trade development in central cities， coastal cities and cities with high human capital level; 3）digital economy can significantly promote the highquality development of foreign trade in the region， while inhibiting the development of foreign trade in surrounding areas. Based on that， relevant countermeasures and suggestions are proposed from multiple perspectives， such as promoting the coordinated development of the digital economy， accelerating technological innovation， and strengthening regional cooperation.

Key words: digital economy; high quality development of foreign trade; indicator system; foreign trade competitiveness; foreign trade spillover

摘要： 基于数字经济的内涵和高质量发展理念，分别构建指标评价体系，评价2011—2019年中国281个地级市的数字经济水平和外贸高质量发展水平，从成本降低、促进创新等角度分析数字经济对外贸高质量发展的影响，考察科技创新的中介效应和外贸高质量发展的空间溢出效应。数字经济显著促进外贸高质量发展，科技创新具有中介效应；数字经济对中心城市、沿海城市及高人力资本水平城市的外贸高质量发展的推动作用更加明显；数字经济显著促进本地区外贸高质量发展的同时，会抑制周边地区外贸发展。基于此，从促进数字经济协调发展、加快科技创新和加强区域联动等多个角度提出相关对策建议。

关键词: 数字经济；外贸高质量发展；指标体系；外贸竞争力；外贸溢出效应