Because the house price and price in big cities are too high, the cost of living in big cities is obviously higher than that in small and medium-sized cities, especially for small towns, the cost of living in big cities is several times higher than that in small towns. In this way, it is bound to limit the inflow of the rural population to the big cities. 
In order to realize urbanization, it is necessary for cities to fully absorb the rural population
 it is an unsustainable and difficult road for our country to realize urbanization only by developing big cities.