Why can't the doctoral program of Dalian Ocean University be approved?

The academic background does not match. The approval of the doctoral program of Dalian Ocean University requires a certain academic background and research ability. If the academic background does not meet the requirements, such as no relevant bachelor's or master's degree, or no relevant research experience, it will be rejected. You can try to make up for the deficiency by self-study or participating in relevant training courses to meet the requirements of the doctoral program.