Megacities refer to those with a permanent population between 5 million and 10 million in urban areas in China's city-tier system. As population flows to big cities, megacities in China have seen rapid growth.

There are 10 cities that fell in the spectrum according to a recently released yearbook on urban construction by the Ministry of Housing and Urban-Rural Development, one more compared with that in previous year. Eight out of the 10 cities saw their GDP surpass the 1 trillion yuan ($152.56 billion) threshold. The GDP of the top city was 2.7 times as much as that of the bottom one.

Let's take a look at the top 10 Chinese megacities by GDP.