Mathematics is not difficult in Mudanjiang Teachers College. The difficulty of postgraduate entrance examination for subject teaching (mathematics) major in Mudanjiang Normal University depends on many factors, such as entrance score, professional ranking, school ranking, proportion of postgraduate entrance examination, enrollment, school popularity, etc., and the difficulty directly affects whether candidates can succeed in postgraduate entrance examination, so the difficulty of postgraduate entrance examination is a factor that cannot be ignored in the postgraduate entrance examination process. The professional ranking of subject teaching (mathematics) in Mudanjiang Teachers College is a factor that cannot be ignored. High professional rankings and hot majors mean fierce competition, which will inevitably increase the difficulty of postgraduate entrance examination. In addition, cross-majors will also increase the difficulty of postgraduate entrance examination, especially liberal arts and cross-science, which is still very difficult for postgraduate entrance examination with only one year of review. It is hoped that candidates will make a comprehensive analysis of the difficulty of the postgraduate entrance examination for the subject teaching (mathematics) major in Mudanjiang Normal University through various channels such as communication with the postgraduate brothers and sisters, communication in the postgraduate entrance examination forum, Baidu communication, and communication in the examination and research group. Only in this way can they finally become graduate students successfully.