1. When binding the children’s medical insurance electronic voucher, you must first prepare the household registration books of parents and children, then download the “National Medical Insurance Service Platform” APP, and activate the parents’ certificate through the “National Medical Insurance Service Platform” APP Electronic medical insurance voucher. 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. After entering the "Binding Method Selection" interface, select "Bind using ID number" and click "Confirm". (Note: Due to differences in the level of medical insurance informatization construction in various regions, some regions may not support the use of "medical certificate of birth" to bind children's medical insurance electronic vouchers, so it is more recommended to choose the method of "using ID number" to bind.) 5 .You will then 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. In this way, you can enter the "Add Family Member" interface, fill in the 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. Then you will enter the "Warm Tips" interface. After carefully reading the Warm Tips, click "OK". 10. In the "Draw Signature" interface, use your finger to draw a signature in the dotted box, and then click "OK". 11. Then 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. Then enter the "Personal Commitment Letter Generation" interface, click "Select from Mobile Phone Album", and select the "Personal Commitment Letter" with completed signature from the 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 the personal page in the household registration book, and use the photo of the 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 the 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. The child's electronic medical insurance voucher is successfully bound to the parents' mobile phone. Click to enter the medical insurance electronic voucher expansion page to use it.