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

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