1. Economic development: Beijing, Shanghai, Guangzhou, Shenzhen and other first-tier cities have strong economic strength, developed service industries and high-tech industries, attracting a large number of internationally renowned enterprises and talents. Second-tier cities such as Chengdu, Chongqing, Hangzhou, Wuhan, Nanjing and Xi 'an have relatively weak economic strength, relatively simple industrial structure and relatively low labor costs, which have attracted the development of small and medium-sized enterprises.
2. Population size: the population, economic aggregate and consumption level of first-tier cities are relatively high. The population of second-tier cities is relatively small, and the total amount and consumption level are slightly lower than those of first-tier cities.
3. Public facilities: First-tier cities have perfect public facilities and relatively superior resources such as education and medical care. The public facilities, education, medical care and other resources in second-tier cities are relatively medium, but they have certain advantages to some extent.
4. Convenient transportation: First-tier cities have convenient transportation, dense international and domestic routes, and relatively developed means of transportation such as expressways and urban rail transit. The traffic in second-tier cities is relatively convenient, but there is still a certain gap with first-tier cities, such as the density of international routes.
Generally speaking, first-tier cities have the strongest economic strength and the highest level of urban development, and become the representatives of the urbanization process in China. However, they also face a series of challenges, such as urban traffic congestion, environmental pollution and high housing prices. Second-tier cities have a certain gap with first-tier cities in terms of economic development, population size, public facilities, convenient transportation, etc., but they also have certain economic, cultural and scientific and educational strength, and are accelerating their development and promoting industrial upgrading and urban modernization.