Benefiting from improved infrastructure and services, companies in the 15 industrial zones in Hainan province had robust growth as their combined revenue increased 53.5 percent in the first four months year-on-year to reach 42.6 billion yuan ($6.9 billion).

At the same time, the zones attracted total government investment of more than 3 billion yuan, up 36.1 percent, and 1,213 new companies, up 30.3 percent.

They are now home to more than 110,000 employees.