1, school seal: If it belongs to a graduation school, the graduation school will generally affix a red seal, which is the official seal of the school.

2. Principal's seal: it is the private broad-brimmed seal of the principal of the graduation school, and the graduation certificate is stamped with the private seal of the then principal of the graduation school.

3. Seal of the local education bureau: the steel seal stamped by the local education bureau, and the certificate is printed under the supervision of the provincial education department. The certificate stamped by the local education bureau is valid, and all three are indispensable.