1. Hire external lecturers for internal training: The general form of this training method is to select lecturers from external training companies or freelancers, and concentrate the personnel who need training in a specific space, and the lecturers will use certain professional training equipment and skills to conduct special training for relevant personnel. 2. Internal trainers carry out internal training: Many enterprises begin to pay more and more attention to the training and application of internal trainers for the sake of training cost and effect. The training form of internal trainers may not be as "professional" as that of external trainers, but the training will not deviate from the basic requirements of enterprise managers for personnel. Internal instructors can understand the internal environment and design and implement targeted training programs. 3. Studying abroad: According to the information of China Training Network, it refers to sending some personnel to participate in training courses, lectures or advanced courses sponsored by external training institutions or universities. 4. Mentoring system: Many companies usually adopt this method when new employees join the company, that is, one or more new employees are assigned to an experienced old salesperson, and the old employee helps the new employees master all kinds of knowledge and skills involved in the work.