本文通过美国著名主持人沃尔特·克朗凯特的主持生涯及其评价,探讨了节目主持人在传媒中的角色,认为主持人既是节目内容的传播者,又是社会舆论的引导者。主持人不仅是一种传媒角色,更是一种媒介力量的显示。主持人作为公众人物必须明确其自身职业特殊性,在职业行为选择和道德素养提升上恪守原则。 This article discusses the role of presenter in the media through the presidential career of Walt Cronkite, a famous American host, and his evaluation. He thinks that the moderator is not only the communicator of program content but also the guide of public opinion. Host is not only a media role, but also a manifestation of media power. As a public figure, the host must be clear about the particularity of his or her career and abide by the principle of selecting professional behavior and enhancing moral qualities.