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After twenty years , the modern public service announcement in our country gradually achieved rapid development , not only accumulated a wealth of practical experience , and also achieved fruitful results of theoretical studies . This article is starting from the communication theory to study the PSAs , learn Lasswell model clarifies the nature of the advertising property on the basis of spread , spread content , communicators , media , five aspects of the dissemination of the object and the dissemination of results analysis , public service ads and commercials in the process of analysis and make the necessary comparisons . The purpose is to spread the essence in order to clear the information of the public service ads , the emphasis on the dissemination of public service ads are the typical information dissemination process , in line with the basic law of the propagation , deepening the awareness and understanding of the public service ads , strengthen the theory and systematic study of the public service ads . From the point of view of communication studies , public service ads analysis as follows : the government, the media , businesses , community groups and individuals in the disseminators of public service ads . The PSAs roughly divided into two categories: one is beneficial to public health ideas , including social education , public service , charitable aid , national culture and nature conservation in five aspects . The other is the focus of the society , hot . Basically the same the PSAs media commercials , newspapers, magazines, radio , TV, and a variety of outdoor media and close media . However , public service ads , media combination of a lack of planning , you need to learn to commercial advertising and learn . The PSAs audience has the breadth and complexity of the characteristics of the two aspects of self-improvement and social care needs of the public service ads . PSAs based on age, the audience is divided into four categories of children, young people , middle-aged and elderly . PSAs social education , cultural dissemination and public opinion -oriented macroeconomic effects , the microscopic effects disseminators dissemination of content , media , dissemination of the audience and so has close ties .
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