Postgraduate re-examination is usually divided into two parts: written examination and interview. The written test mainly tests the basic knowledge of specialized courses, and some universities also test English. Relatively speaking, the difficulty is not high, but it also needs candidates to take it seriously. Interview is the core link in the re-examination, because the candidates who pass the preliminary examination have little problem in written examination in general colleges and universities, and the main reasons for the low grades in the re-examination are concentrated in the annual re-examination stage.