The invitation letter should contain the following:

(1) Personal information of the invitee (applicant), including name, gender, 
date of birth, passport number, relationship with the inviter, etc.

(2) Information on the visit of the invitee (applicant), including the reason 
for going to China, the date of the proposed trip to China, the place of 
residence, the period of residence, the source of expenses, etc.

(3) Information of the inviter, including the name, profile, contact 
telephone number, address, signature, of the inviter, etc.