If the secret card is lost, you need to send a fax. The process is: if the ID number corresponding to the account number is true and valid and can provide a matching copy, it needs to be sent by fax, surface mail or express delivery. Go to official website to find the customer service center, click on the secret card to report the loss, fill in the information, and click Submit. Download the fax acceptance application form on the page, get the fax service code from the downloaded page, fill in the fax service code record in the fax acceptance application form, and attach a copy of the real and valid ID number corresponding to the account number. The second-generation ID card needs to be double-sided, and the signature is handwritten below. Send the fax acceptance application form to the official, the fax number is 0 10-58859 179, press 2 to send the fax, and then press 1 to send the fax. Fax acceptance time is within 3 days after the fastest verification.