To set multiple announcements in Douyin live broadcast room, you can follow the steps below:

1. Enter the Douyin personal homepage, click "Me" in the lower right corner, and then click "Live Management" at the top.

2. Enter the live broadcast management page, find "Live Broadcast Room Settings" at the bottom of the page, and click "Preset Announcement".

3. Click the "Add Announcement" button, and then enter the announcement content to be set in the input box.

4. After clicking "Save", you can continue to add other announcements, and so on, until all announcements are added.

5. After adding, during the live broadcast, enter the "Live Broadcast Room Settings" to see all preset announcements.

It should be noted that the display time of the preset announcement is fixed and cannot be adjusted. At the same time, in order to allow the audience to better see the announcement, it is recommended that the announcement content is brief and clear, and should not be too long. In addition, during the live broadcast, do not use the announcement area for other purposes to avoid confusing the audience.