The tension between the pursuit of publicity by “public” and the praise of “private” by “relationship” in public relations has always been the fundamental cause of the legalization and stigmatization crisis of China’s public relations. Based on the public characteristics of Western political philosophy and public relations, this paper creatively puts forward the “contingency model of publicity” of China’s public relations practice by means of questionnaire survey and grounded theory, so as to explain the internal logic of China’s local public relations practice. The research shows that: the publicity of China’s public relations practice is rooted in the cultural tradition of family, country and the world. In the contingency game between “public” and “private”, it presents a dynamic picture of “public-private mixture”, in which the public practice form of “public-private Juxtaposition” is the most rational. The degree of “publicity” of Chinese public relations practice will be affected by the four dominant factors of organizational characteristics, media characteristics, environmental characteristics, public characteristics and the implicit factor of practitioner relationship characteristics, which will change continuously in the degree of “extremely public” and “extremely private” publicity. The publicity of China’s local public relations practice does not exclude the relationship, which will promote or restrict the external performance of the publicity of public relations practice in varying degrees.