Check this one. 回复：救命啊。。。哪位好心提供一个H4签证给VO的邀请信样本？

It is very simple. For your reference:

Month/date/year
U.S. Embassy in xxxx, China
Nonimmigrant Visa Unit
Street address of the Nonimmigrant Visa Unit


TO WHOM IT MAY CONCERN

Dear Sir or Madam:

I am writing this letter to confirm:

I, XXX XXX (your name), born on month/date/year in XXXXXX, China (same as in your passport). I’d like to invite my hu*****and/wife XXX XXX, born on month/date/year in XXXX, China, to join me in the United States.

I will pay all of her/his living expenses in US and pay for her/his travel fees.

I would deeply appreciate you if you could approve her/his visa application and issue her/him the H-4 visa.

Thank you very much!


With best wishes and regards,


Yours sincerely

Your signature


XXX XXX (Print your name)

*********************************
Your title
Your office (employment) address in US

Your home address in US

*********************************


此外，重要的是你在美国的雇主需出具一封信， 证明你的 employment 以及你要邀请你 spouse 来美。

Good luck!