The method for writing supporting materials for correspondence is as follows:

1. Title: clearly state the supporting materials for correspondence.

2. Recipient: Indicate the name and address of the organization or individual receiving this letter.

3. Introduction: Briefly explain the purpose of writing the letter, that is, requesting relevant supporting materials. Detailed description: List the required supporting materials in detail, including file name, content, date, etc. Depending on the circumstances, explain why the material is critical to the case or matter. Time Requirements: There are specific time requirements which should also be mentioned in this section.

4. Ending: Express gratitude and hope that the other party will reply as soon as possible.

5. Signature and date: The signature and date of the writer.