1. Excessive visits: In some time periods, a large number of students and parents visit the student loan system of China Development Bank at the same time, resulting in high server load and slow system response. You can wait a while before continuing your visit.

2. System maintenance or upgrade: China Development Bank regularly maintains or upgrades the student loan system. In the meantime, the system will be temporarily inaccessible or slow to respond, and it can wait until the system upgrade is completed.