Based on the new structural economic theory,this paper estimates the limitation of the technological externalities of industrial agglomeration,and the interaction between the government’s scientific and educational support and industrial agglomeration by constructing Spatial Durbin Models and using the data of 108 cities in the Yangtze River Economic Belt from 2003 to 2019.The results show that below a certain critical value,industrial agglomeration can promote the improvement of total factor productivity,while excessive agglomeration will pro...