Take the postgraduate entrance examination of hydraulics and river dynamics of Sichuan University School of Water Resources and Hydropower/State Key Laboratory of Hydraulics and Development and Protection of Mountains and Rivers as an example. The difficulty of postgraduate entrance examination depends on many factors, such as admission scores, professional rankings, school rankings, the proportion of postgraduate entrance examinations, the number of students enrolled, 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 process of postgraduate entrance examination.

The ranking of hydraulics and river dynamics of Sichuan University School of Water Resources and Hydropower/State Key Laboratory of Hydraulics and Development and Protection of Mountains and Rivers 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 before deciding to apply for colleges and majors, candidates will make a comprehensive analysis of the difficulty of the postgraduate entrance examination of hydraulics and river dynamics in the School of Water Resources and Hydropower of Sichuan University/State Key Laboratory of Hydraulics and Development and Protection of Mountains and Rivers through various channels, such as exchanges with graduate students' brothers and sisters, forums for postgraduate entrance examination and group exchanges. Only in this way can they finally become graduate students successfully.