1. Go to the Academic Affairs Office of Lanzhou University to check your graduation situation and get your diploma. If you have received a diploma before, but lost it, you can apply to the Academic Affairs Office for a replacement diploma.

2. If you haven't received your diploma before, you can apply to the Academic Affairs Office of Lanzhou University for a replacement. You need to provide a copy of your ID card, the original degree certificate and other related materials, and pay a certain replacement fee.

3. If the degree certificate is lost, you need to apply to Lanzhou University Degree Center for a replacement. You need to provide a copy of your ID card, the original degree certificate and other related materials, and pay a certain replacement fee.