The score of Chang 'an University is calculated according to the weighted total score of candidates' subjects, as well as the credits and grade points of the subjects. The specific calculation method is: total score ÷ (credits × grade point) × 100%. This is because Chang 'an University believes that the credits and grade points of the subjects applied for are important indicators to measure the learning ability of candidates, while the total score is only a simple indicator to show the learning ability of candidates.