External trainers mainly include external trainer teaching pool, recommended by brother companies, recommended by insiders who have participated in similar training, media reports or advertisements, and trainers learned by other companies through other channels. External trainers need to hire experienced trainers to achieve the expected results. The ways of hiring external trainers mainly include teacher pool, recommendation from brother enterprises, recommendation from internal personnel who have participated in similar training, media reports or advertisements, and trainers learned by other enterprises through other channels. The advantage of hiring external trainers from enterprises is that they have a wide range of choices, can obtain high-quality training teacher resources, can bring many brand-new ideas, are very attractive to students, can improve the training level, and attract the attention of all aspects of enterprises.