By the national Ministry of Human Resources and Social Security unified identification, identification of qualified in accordance with the relevant provisions issued by the corresponding level of People's Republic of China (PRC) vocational qualification certificate. Assistant enterprise trainers issue the third-level certificate of national vocational qualification, enterprise trainers issue the second-level certificate of national vocational qualification, and senior enterprise trainers issue the first-level certificate of national vocational qualification as the only vocational qualification certificate for employment, entry, promotion and salary increase. This certificate is universal in China and internationally recognized.