In recent years, many universities have adopted the adjusted median method as a way to adjust scores between the optional subjects on university entrance examinations. However, there has been little discussion of its nature from a test theory perspective. Therefore, we examined the kinds of adjustment results that are produced by using the adjusted median method to adjust scores according to the difference in mean and standard deviation between the optional subjects. Results indicated that when test scores are distributed in normal distributions, the adjusted median method generally adjusts the score so that subjects which originally have a high mean distribution with a large standard deviation are more advantageous to the top performers.In principle, score adjustment should be carried out to eliminate such inequity. Meanwhile, the adjusted median method is advantageous in that even after adjusting the score, the zero and perfect scores remain unchanged, and the adjusted score can be easily calculated by using the median. The advantages and disadvantages of this method must thus be considered when being implemented.