Chinese F visa for doing research for short term (2 months)

I am trying to go to China to do research for a short period (~2 months). It seems the visa type I should apply is "F". I got an invitation letter from the supervisor in China saying that he is inviting me and all the expenses will be paid.
However when I go to apply for the visa they said that I need to provide an "invitation letter of duly authorized unit". But when I contacted my supervisor it seems to get such a letter we (myself and the university in China) should have a license agreement, etc.
Do you think the visa type (F) I am applying is the right one? If it is so, how to get "invitation letter of duly authorized unit"?
Best Answer
The University will have to arrange the letter. See the similar question.
You could try your luck with just an invitation letter on the institution letterhead and the name and copies of the ID documents of the professor. She should be able to email those documents. The letter should have the official chop.
If they are unwilling to do that, I might question the legitimacy of the offer.
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How long can you stay in China with an F visa?
The duration of stay of a "F" visa is 30 days, which means the holder of the visa may stay in China for up to 30 days from the date of entry. The visa officer may extend the Duration of Stay if the applicant needs and requests a stay in China for more than 30 days.How do I get a Chinese F visa?
F Visa is issued to an alien who is invited to China for a visit, an investigation, a lecture, to do business, scientific-technological and culture exchanges, short-term advanced studies or intern practice for a period of no more than six months.How long does it take to get a Chinese study visa?
You should apply for a study visa for China around one month before your intended date of arrival in China, but it is recommended not to apply earlier than 3 months before that date. Usually, all Chinese embassies are very efficient and the processing time for a visa may only take one week or even less.What is short visit visa?
The short-stay visa is a Schengen visa. It allows you to stay in the Schengen area for a maximum of 90 days within a 180-day period. Your visa will be valid for a specific period. This period may be shorter than 90 days. You can travel freely between the 26 Schengen countries while your visa is valid.CHINA DIARY EP5: It's FINALLY happening!!! Chinese visa approval and pet relocation update
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