The difference between the enrollment order of the ethnic preparatory class in Chang 'an University and the first one lies in the different enrollment objects, different admission standards and different admission order.

1. Enrollment target: Ethnic preparatory classes mainly provide special education and training for students with certain ethnic minority backgrounds to help them adapt to the learning environment of higher education. The admission list is determined according to the national unified college entrance examination results and the registration of relevant candidates.

2. Admission criteria: Ethnic preparatory classes will formulate some preferential policies according to the special circumstances of ethnic minority students, appropriately lower the minimum admission score, or provide preferential admission channels for ethnic minority students. An admission is mainly based on the college entrance examination results and rankings to determine the admission list.

3. Admission order: ethnic preparatory classes are admitted in advance before the admission of a book, providing more time and opportunities for ethnic minority students to prepare for their studies. After the results of the college entrance examination are announced, they will be admitted in the order of ranking.