It depends on which visa you would get for yourself. If you go there to work on a Z Visa, your family should be covered as well. If you intend on staying for a few years though, you would need to get a residence permit.
Have a look at our Visas for China and Work Permits for China pages, which give an overview of the process you'd need to undertake.
Good luck, I hope you and your family have a long, happy stay.
Expat Health Insurance
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