Adult colleges and universities refer to a way for candidates with secondary education to enter colleges and universities through the unified entrance examination. Adult colleges are all over the country, such as Beijing University of Science and Technology, Duff University, Nancai University, National People's Congress, Shenzhen University, Huazhong Normal University, Xi Institute of Technology and tianjin polytechnic university. Generally speaking, the number of adult colleges is not small, and the teaching quality is good.