The biggest difference between first-tier cities and second-tier cities: population size, economic development scale, urban construction scale, living standard, consumption index, economic (wage) income, wealth, urban influence, etc. Some are divided by the number of permanent residents in cities and towns: more than 6.5438+million in first-tier cities, 5 million-6.5438+million in new first-tier cities and 3 million-15 million in second-tier cities. Some are divided according to political status, economic strength, city size and regional radiation. Jones Lang LaSalle distinguishes first-and second-tier cities according to GDp, population, wealth, investment, retail sales, household savings, educational infrastructure, land transfer and retail sales. Others are classified according to the commercial charm of China, such as the concentration of commercial resources, urban hub, urban crowd activity, urban diversity and future plasticity.