This study uses a rich city-level dataset to analyse the relationship between information and communication technology (ICT) and economic growth in Chinese cities during 2001–2016. It is shown that ICT not only improves the aggregate efficiency of a city but also helps the city absorb technological diffusion from the frontier city. In addition, distance plays little role in technological diffusion process associated with ICT. Cities geographically farther away from or closer to the frontier city can equally benefit from technological diffusion as long as they have the same level of ICT development.