Second-tier cities refer to metropolises that have great influence on their own economy and society. Compared with first-tier cities, it has less influence, mainly regional influence. There are 36 second-tier cities in China, including Suzhou, Ningbo, Quanzhou, Hefei, Taiyuan, Yangzhou, Daqing, Huai 'an, Nanning, Guilin, Baotou, Hohhot, Kunming, Harbin, Wenzhou, Zhuhai, Guiyang, Foshan, Zhongshan, Jiaxing, Zhengzhou, Changzhou, Nanchang, Dongguan, Weihai, Zhenjiang, Linyi, Huizhou and Changchun.
Among them, the second-tier cities in the south are Suzhou, Ningbo, Quanzhou, Hefei, Huai 'an, Nanning, Guilin, Kunming, Wenzhou, Zhuhai, Guiyang, Foshan, Zhongshan, Jiaxing, Changzhou, Nanchang, Dongguan, Zhenjiang and Huizhou.