Guangzhou and Shenzhen are densely populated, with poor air and high housing prices. They are good places to struggle, but they are not suitable for health preservation.

The population of Zhuhai is not so dense, but the public security is better, and the city is cleaner and suitable for health preservation.

Haikou and Sanya are good places for tourism, vacation and health preservation, but in the past two years, industrial development is still not as intensive as the above three cities.