After the invitation is issued, can it be changed or cancelled?

Generally, if the invitation is still valid and has not been used, you can apply to change some information, such as the visit time or personnel details. However, you need to provide a valid reason and relevant supporting documents, and you may need to pay a certain fee. In special circumstances, such as the applicant's travel plans being cancelled, you can also apply to cancel the invitation, but you must notify the relevant department in time and follow the required procedures. (Adam)