With changes in social,political,economic,cultural and other institutional elements and the iterative development of media technology,the political ecology and media ecology of news are constantly changing. The interdisciplinary characteristics of journalistic ethics are more prominent. Basic issues in the construction of this discipline, such as research objects, theoretical frameworks, and subject categories,are receiving increasing attention. Focusing on core issues such as anomie,value conflict,moral choice,and ethical dilemma in the practice of news production and communication in New China,this paper studies the changes of journalistic professional ethics and journalistic ethics in different political environments,technical conditions and media ecologies in the past 70 years. In the context of behavioral norms,relationship considerations,value choices,ethical construction,we explore possible paths of journalistic ethics study in the new era and new business,with a view to promoting the normative construction of journalistic ethics and the development and perfection of journalistic ethics.