Professional trainer certificate is useful. According to the inquiry of Article 8 of People's Republic of China (PRC) Vocational Education Law, the implementation of vocational education should be based on the actual needs, adapt to the occupational classification and occupational grade standards formulated by the state, and implement the system of academic qualifications, vocational training certificates and vocational qualification certificates. The state practices a system in which laborers receive necessary vocational education before taking up employment or taking up their posts. The holder of the national vocational training certificate shows that he has passed the training organized by the Ministry Center and the corresponding examination, and has the corresponding professional skills and knowledge. Vocational trainers refer to full-time and part-time "double-qualified" teachers who can study and formulate training programs for emerging occupations (jobs) according to the requirements of economy and technology, vocational education, production and operation of enterprises and employment of workers, master and apply modern training concepts and technical methods, and provide professional, skilled and practical vocational education and training teaching, management and consulting services for various vocational education and training institutions, enterprises and institutions.