If you've only got one entry then when you fly to Beijing you'll be using that one entry up.

Hong Kong is considered a Special Administrative Region and going there involves a border crossing complete with immigration and customs. You receive an entry stamp (and automatic 90 day visa for most countries) upon arrival and an exit stamp when you leave.

Short answer: If you go to Hong Kong, and you've only got a single entry visa, then you'll need another visa to re-enter China.

I think if you work in beijing ,you'd better apply for a work visa ,and before you go to HK,you can apply for the employment certificate and invitation letter,and then you can take these two documents to go to HK to get a temperary Zvisa .

if you don't want to do like this ,you have to extend your F visa with multi-entry .

good luck

Amanda
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email:amanda.fortunecom@gmail.com
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You need to get straight what you're legally allowed to do on a Business visa, which is not the same as a Work visa. You say you are coming on a business visa but to work in Beijing. If your work is something like an internship, or relatively short-term consulting or something that will take three months and then end, you should be OK on the Biz visa you have.

If you are going to be really setting up home in Beijing and working indefinitely, upon arrival, your employer should be willing to give you the paperwork you need to get down to HK, get a Z (work) visa, then have you return to China and expedite the process to help you get your Residence permit. Some employers are able to get this accomplished without you leaving Beijing, but if you wanted to schedule a visit to HK to see friends anyway...a trip can do double-duty.

If your employer wants you to work indefinitely and continuously in Beijing on a Biz visa, that would be a red flag.