The national line is the basic requirement standard for candidates to enter the re-examination, which is determined by the Ministry of Education according to the postgraduate training objectives, enrollment plans, students sources and preliminary test results. Including the requirements of the total score of the subject to be tested and the score of the single subject. Candidates must meet the conditions that the total score and scores of all subjects cross the line at the same time, that is, double crossing the line, in order to be admitted. The national line is divided into academic retest score line and professional degree score line, namely academic retest line and specialist retest line. Every year in mid-March, the Ministry of Education will announce the national line of that year. Candidates whose total score or single subject scores fail to meet the requirements of the national line will not be able to participate in the re-examination.