The method is as follows:

1. Contact the billing party: you can contact the business or unit that issued the electronic invoice and ask the other party to resend an electronic invoice.

2. Use the national VAT invoice inspection platform: If you remember some basic information of the invoice, such as invoice code, invoice number, invoice date and amount, you can query and download it through the national VAT invoice inspection platform.

3. Use electronic invoice management tools: Some third-party tools or small programs, such as the ticket manager on Alipay, can help manage and automatically download electronic invoices. You can search for the ticket manager in Alipay, get an email account number, and then provide this email address to the drawer, so that it can be sent directly to the email address when invoicing in the future, which is convenient for obtaining and managing electronic invoices in time.

4. Check the e-mail: Sometimes the e-invoice has been sent to the e-mail box, but I just didn't notice it. Please carefully check the e-mail box, including the junk mail folder, to see if there are any e-invoices that I haven't noticed.