There are four main forms of adult continuing education, and there are four main forms of national education series adult continuing education, namely, adult higher education, higher education self-study examination, modern distance open education of RTVU and online university. These four forms of education have their own characteristics. Except for adult higher education, the other three items do not need to take the national unified entrance examination. There are also great differences in admission, curriculum, graduation years, charging standards, degree awarding, and class methods.