There are too many people. Central South University's school leaving system is that after the tutor completes the graduation audit, the graduate students log in to Central South University's school leaving system and go through the school leaving procedures. Only after completing all the school leaving formalities can they get the graduation photo and degree certificate. The approved capacity of the system is 2,000 people. If more than 2000 people log in at the same time, boarding will fail. This is a measure to prevent the server from crashing.