The doctoral program of plant genetics in Zhejiang University is generally 3 to 4 years. The specific graduation time will vary according to the individual's academic progress, research topics and the requirements of the tutor. During the doctoral degree, students need to complete a certain number of courses, mainly doing research, writing papers and participating in academic exchanges. After reaching a certain research achievement and academic level, students need to obtain a doctorate through defense and other procedures. Doctoral degree is the highest academic degree and the highest recognition of postgraduate education. Studying for a doctorate requires a certain academic background and research ability.