The process in which the communicator chooses to process the information, deliver it to the receiver through certain channels and cause a response. Communication is a multi-factor and multi-link process. Lasswell, an American communication scientist, put forward the famous "5W" process model, that is, the communication process consists of five elements and links: disseminator, content, channel, receiver and communication effect. In addition, mathematicians Shannon and Weaver put forward a linear model of electronic signal transmission process, and communicators Shi Lamu and osgood put forward a circular model of social communication process. -linear model of propagation process In the history of propagation, H. lasswell, an American scholar, first put forward the propagation process model. 1948, in a paper entitled "Structure and Function of Communication in Society", he first put forward five basic elements that constitute the communication process, and arranged them in a certain structural order to form a process model, which was later called "5W Model" or "lasswell Plan". These five W's are the first letters of five interrogative pronouns in English, that is, who said what to whom on which channel and what effect it had. For the first time, lasswell model clearly describes the daily communication activities that people engage in but can't explain clearly as a process consisting of five links and elements, which provides concrete information for people to understand the structure and characteristics of the communication process. In fact, the five fields of mass communication research, namely control research, content analysis, media analysis, audience analysis and effect analysis, are all formed along the lasswell model. As an early process model, lasswell model is incomplete, mainly because it belongs to one-way linear model. Although lasswell considered the recipient's reaction (effect), he did not provide feedback channels. Therefore, this model does not reveal the two-way interactive nature of human social interaction.