You didn't get the diploma of South China University of Technology, that is, you didn't complete all the credits before graduation and didn't meet the requirements, so you didn't have a diploma. Generally, it is because the course is full, but not all subjects are qualified, and the credits can not meet the requirements for obtaining a degree certificate.

Those who meet the graduation requirements but do not meet the conditions for conferring degrees will only be issued with graduation certificates, and no degree certificates will be issued. At present, most schools in China require a GPA of 2.0 or above (generally a weighted average score of 70) to award a bachelor's degree, otherwise they can only get a diploma. Some schools have special requirements, such as cheating in exams, and they can only get diplomas when they graduate, but they can't award bachelor's degrees.

Undergraduate students want to graduate smoothly and get a degree certificate. Credit rating points need to meet certain requirements. Many universities require a GPA of 2.5 (equivalent to 65), while those well-known universities require a GPA higher than this, so even if they fail the final course, they may not get a degree certificate.