The National Open University generally implements the credit system, which lasts for 2.5 years. Its learning forms are flexible, mainly including online education, face-to-face teaching and self-study. Students can arrange their learning progress according to their own time and habits. At the same time, the National Open University also provides students with relatively perfect learning support services, such as learning resources, online Q&A, course forums, etc., so that students can better complete their studies.