1. First, write the words "Witness" at the top center of the document.

2. Then write the witness’s name, ID number, contact information and other information below the title.

3. Then describe in detail the specific circumstances of the event or behavior witnessed, including time, place, people, process, etc.

4. Then draw corresponding conclusions based on the content of the testimony.

5. Then under the witness content, the witness must sign and indicate the date.

6. Finally, if there is relevant evidence or documents, they can be attached to the back of the witness certificate as an attachment.