Personal motivation, education level, trainer's potential, service consciousness. In the training program of internal trainers, it is necessary to screen from three aspects: enterprise, industry and specialty. As an internal trainer, its core function is to transfer knowledge and cultivate talents through training activities. This requires that candidates for internal trainers need to have a certain professional foundation. Its "professionalism" requirements are manifested in these aspects: personal motivation, education level, trainer potential and service consciousness. The four contents are the necessary skills of internal trainers and the embodiment of indispensable tools and abilities in daily work.