Operating environment: Xiaomi 1 1, miui 1 1, wechat 8.0. 1, etc.
1. First open the WeChat app and click "My".
2. Click the side arrow of the personal information above.
3. Click "QR code business card" in the personal information interface.
4. Click the three points on the upper right in the QR code business card interface.
5. Finally, select "Change Style" in the pop-up options below to replace the background picture of the WeChat business card.