The National Open University is an adult institution of higher learning approved by the Ministry of Education, and its winemaker certificate is issued after relevant education and training. According to "People's Republic of China (PRC) Vocational Education Law" and "People's Republic of China (PRC) Academic Degrees Regulations", the academic qualifications and certificates of adult higher education have legal effect. Therefore, the winemaker certificate issued by the National Open University is recognized and accepted in the winemaking industry.