1. The word "invite" is printed or written on the cover of the double invitation card.

2, regardless of single post, double post, in the post writing is roughly the same.

3. State the activities of the invitee, such as attending symposiums, parties, banquets, etc., and explain the detailed time and address.

4. Write "please" and "return the gift" at the end, which was called "gift" in ancient times.

5. The signature shall indicate the unit or name of the inviter and the time when the invitation was announced.