Technicians are not professional titles, but professional qualifications. Vocational qualification is the basic requirement of knowledge, technology and ability necessary to engage in a certain occupation, which reflects the ability of workers to use specific knowledge, technology and skills to meet the needs of professional labor. Different from academic diploma, academic diploma mainly reflects students' learning experience and is a proof of cultural theory knowledge level. Professional qualifications are closely combined with the specific requirements of professional labor, which more directly and accurately reflects the actual working standards and operating norms of a specific occupation and the actual working ability level of workers engaged in this occupation. Engineer is a professional title. Generally speaking, it is a kind of qualification, and it is a kind of recognition of individual professional technical level and professional skills by the state. Professional and technical personnel who meet certain conditions in state organs, enterprises and institutions can obtain corresponding professional and technical titles through examination and evaluation. Civil servants and professional managers have only job grades, but no professional titles. The technical level of workers is the identification of workers' skill level, not their professional titles, but in practice, the skill level is managed with reference to professional titles, that is to say, they are not professional titles but enjoy the treatment of professional titles.