Similar to online education, the open university adopts online teaching, and students can study in their spare time at any time, with flexible time. Correspondence is a learning form of adult college entrance examination education. Mainly according to the teaching plan of each major, teachers are sent to correspondence stations around the country to organize face-to-face lectures and exams, which is relatively inflexible.

After entering the open university, students don't need to go to school. Students can learn distance through multimedia technologies such as radio, television and computer. Corresponding to the school mailing textbooks and learning materials, candidates read and study at home, and there will be face-to-face counseling by teachers. The open universities are radio and television universities in various provinces and cities, while the adult education colleges or continuing education colleges of ordinary universities have correspondence courses.

Types of education in open universities:

1, distance education

Distance education in open university is a network-based education model. Students can learn through multimedia resources on the network platform, including course videos, courseware and learning materials. The main advantage of distance education is that students can freely choose the content and time of study, which is not limited by time and place. At the same time, they can communicate and interact with teachers and other students at any time, which improves the flexibility and efficiency of learning.

2. Open learning

Open learning in open university is an autonomous learning mode with students as the main body. Students can choose their majors and courses according to their own interests and needs, and at the same time they can study according to their own time and place. The advantage of open learning is that students can freely choose learning content and time, which is more in line with their own learning needs and interests, and can also make better use of students' time and energy.

3. Autonomous learning

Autonomous learning in the open university is a way of learning based on students' self-management and self-learning. In the open university, students need to make their own study plans, choose study contents and arrange study time. This requires students to have certain self-management and self-learning ability. The advantage of autonomous learning is that students can control their own learning process and direction more independently, which is more in line with their learning needs and interests, and can also make better use of students' time and energy.