1. First, open "Meitu Xiu Xiu" in your mobile phone and click "Picture Beautifying".

2. Then enter the mobile phone photo album and click on a photo, as shown in the figure below.

3. After the photo is uploaded, click "Edit", as shown in the figure below.

4. Then click "wallpaper" (the size of mobile phone wallpaper) on the editing page, as shown in the figure below.

5. After completion, the photo has been changed to full-screen scale.