在这部《大同》片中,在耿彦波市长上台之前，大同是标准的工业型城市。由于煤矿开采，大同曾经是中国空气污染最严重的城市之一。而新上任的耿彦波市长想要改变大同的现状，努力推动大同转型为旅游城市。同时本片在拍摄的过程中也反映了人民群众对耿市长的态度和声音。

DATONG follows the life and work of a controversial Chinese Communist Mayor GENG YANBO to tell the story about how he takes a radical reform to demolish 140,000 households and relocate half a million people to give way to restoration of Ancient relic walls in order to adopt a clean economic growth from tourism and culture, which he believes will do good to DA TONG citizen in the long term. With two years in the footsteps of GENG, along with the changing ideology and confrontations from the public, the film is trying to draw a looming shape of future of China.