As　a　new　model　of　urban　development,　it　is　important　to　scientifically　analyze　the　impact　of　smart　cities　on　the　quality　of　foreign　direct　investment　(FDI).　This　article　constructs　a　difference　in　differences＇　model　to　test　the　impact　of　foreign　direct　investment　quality　in　smart　city　construction　based　on　panel　data　of　226　prefecture-level　cities　from　2006-2017.　Study　shows　the　following.　(1)　The　construction　of　smart　cities　has　significantly　improved　the　quality　of　FDI　utilized　in　pilot　cities.　(2)　Heterogeneity　analysis　shows　that　smart　city　construction　significantly　contributes　to　the　quality　of　FDI　in　the　western　city　subsample　and　a　subsample　of　cities　with　low　natural　resource　dependence.　After　a　series　of　robustness　tests　and　placebo　tests,　the　above　conclusions　still　hold.　The　results　of　the　study　suggest　that　China　should　further　promote　the　construction　of　smart　cities　to　optimize　the　quality　of　foreign　direct　investment　and　promote　high-quality　economic　growth.　The　findings　of　the　study　also　provide　theoretical　and　practical　references　for　the　construction　of　smart　cities　in　China　and　other　countries　around　the　world.