The current senior high school entrance examination has the dual functions of junior high school academic level detection and senior high school entrance examination. The senior high school entrance examination should evaluate the academic level of junior high school students and let most students complete nine-year compulsory education, so the difficulty of the examination questions should not be too high. On the other hand, the results of the senior high school entrance examination are the basis of high school selection, which requires a certain degree of discrimination and a certain degree of difficulty.