关键词: 自贸区, 经济集聚, 城市创新, 空间溢出, DID

Abstract: This paper focuses on the impact of the establishment of Free Trade Zone on the innovation ability of the city，using the panel data of 257 cities from 2003 to 2019 and the DID model to identify the policy effectThe results show that: Firstly，the establishment of Free Trade Zone significantly promotes the innovation ability of the city，and the conclusion is still valid after a series of tests such as instrumental variable methodSecondly，in terms of impact mechanism，the establishment of Free Trade Zone can promote the innovation ability of the city through economic agglomerationThirdly，in terms of spatial spillover，the establishment of Free Trade Zone is a Pareto improvement to the innovation ability of surrounding cities，which is reflected in the significant increase of per capita lowend patent authorization in surrounding citiesFourth，in terms of heterogeneity，the establishment of Free Trade Zone has batch and regional heterogeneity in improving the innovation capacity of the cityThe research conclusion of this paper is of great significance for the construction of Free Trade Zone，the implementation of innovation driven development strategy and highquality economic development

Key words: Free Trade Zone, economic agglomeration, urban innovation, spatial spillover, DID