The article examines how cities like Nanjing are growing and taking over farmland, causing a reduction in the land available for farming. They explore the problems caused by urbanization, including expanding cities and developing suburbs. The focus is on the shrinking amount of land where crops can be grown. The research shows that urban growth is indeed reducing the area of farmland in Nanjing. The authors discuss the reasons for this loss of cultivated land and suggest ways to address the issue and protect farming areas.