Abstract:the research on the impact of smart city on urban economic efficiency is still lacking. This natural experiment based on this quasi smart city construction, using the difference-in-difference method to estimate the influence of the wisdom of the city on the city"s economic efficiency. This paper concludes that the construction of smart city can significantly improve the economical efficiency of the city. during the implementation of smart city pilot in 2012, the implementation of smart city strategy of the city to implement the strategy of city economic efficiency by about 1 percentage points. Finally, based on this conclusion, some policy suggestions are put forward.