1. Download the “National Medical Insurance Service Platform” APP and activate your own medical insurance electronic voucher through the “National Medical Insurance Service Platform” APP. 2. Log in to the "National Medical Insurance Service Platform" APP, enter the main interface, and click "My" in the lower right corner. 3. Enter the "My" interface and click "Add My Family Members". 4. Enter the "Binding Method Selection" interface, select "Bind using ID number", and click "Confirm". Note: Because the system is not perfect yet, it is not recommended to use the "Medical Birth Certificate" to bind your child's medical insurance electronic voucher. 5. Enter the "Notification of Adding Family Members" interface. After reading and agreeing, select "Read the Notification of Adding Family Members" and click "I have read and agree". 6. Enter the "Add Family Member" interface, fill in your child's "Name" and "ID Number" and select "Relationship" - "Children", and click "Click to Upload Personal Commitment Letter". 7. Enter the "Generate Personal Commitment Letter" interface and click "Generate Personal Commitment Letter". 8. Enter the "Personal Commitment" interface and click "Start Signing". 9. Enter the "Warm Tips" interface, read the warm tips carefully, and click "OK". 10. Enter the "Draw Signature" interface, use your finger to draw a signature in the dotted box, and click "OK". 11. Enter the "Personal Commitment Letter" interface where the signature is completed, and click "Save and Submit". 12. Enter the "Warm Tips" interface and click "Save". 13. Return to the "Add Family Member" interface and click "Click to View". 14. Enter the "Personal Commitment Letter Generation" interface, click "Select from Mobile Phone Album", and select the completed and signed "Personal Commitment Letter" from your mobile phone photo album. 15. Return to the "Add Family Member" interface and click "Click to upload my household registration book". 16. Enter the "Photography" interface, click "Photography", take a photo of your personal page in your household registration book, and use the photo of your personal page. 17. Return to the "Add Family Member" interface and click "Click to upload the bound person's household registration book". 18. Enter the "Photography" interface, click "Photography", take a photo of the personal page in your child's household registration book, and use the photo of the personal page. 19. Return to the "Add Family Member" interface and click "Add Account". 20. Your child's electronic medical insurance voucher is successfully bound to your mobile phone. Click "Enter the medical insurance electronic voucher expansion page" to use it.