The book provides a relatively scientific and complete knowledge system, especially knowledge of scientific theoretical basis in this field, based on the perception that the demand for PR knowledge is increasing while the amount of existing knowledge is still lacking, especially in terms of theoretical basis. This is a necessary component of a comprehensive PR training program that will produce professional PR human resources to satisfy society's demands; elevate PR to the status of a professional vocation, a science, deserving respect and suitable societal development investment. Knowledge in public relations is also useful in related professions such as journalism, marketing, and so on.