2017年恰逢中国人民解放军建军90周年，回顾90周年建军史，一方面，人民解放军在争取民族独立、生产建设、抗洪救灾等多领域扮演重要角色，在人民群众心中树立了良好形象；另一方面，随着网络和自媒体的发展，涉及解放军的网络谣言和恶意中伤不断涌现。在此背景下，研究人民解放军的媒介形象变迁，对于新时代主流媒体更好地塑造解放军形象有着重要意义。 本研究以《人民日报》为研究对象，从其1946年至2017年72年来标题中出现“解放军”的有效文章中，抽取666篇文章进行内容分析。在研究《人民日报》关于人民解放军的报道框架时，作者按照报道时间、标题词频、报道体裁、报道版面和报道话题等进行详细分析，从而得出《人民日报》塑造人民解放军形象的经验与不足；在研究《人民日报》中人民解放军的媒介形象变迁时，作者利用框架分析法，发现历史上人民解放军先后呈现出“战斗英雄”、“生产建设英雄”、“毛主席的忠诚战士”、“抗险救灾英雄”和“中国梦的坚强护盾”等五种形象。 新时代《人民日报》在塑造人民解放军的形象时，要深刻理解和把握党中央关于军队建设的重要指示，适当提高军队题材报道量和头版指数，营造舆论热度，多种报道体裁、多种媒体平台、多种媒体形式齐发力，增强解放军形象的鲜活度，最后要突出解放军共和国卫士的核心形象，为实现我国的强军梦鼓与呼！

2017 is the 90th anniversary of China's people's liberation army.Review of the 90th anniversary of the history of the PLA, on the one hand, the people's liberation army in the fight for national independence, production and construction, flood relief, such as many areas play an important role, in the heart of the people set a good image;On the other hand, with the development of the Internet and the self-media, Internet rumors and malicious slanders from the PLA are constantly emerging. In this context, the study of the transformation of the media image of the people's liberation army is of great significance to the better shaping of the PLA image in the new era. In this study, the People's Daily was used as the research object, and 666 articles were extracted from the effective articles of the "people's liberation army" from 1946 to 2017. In the framework of the People's Daily reports of the people's liberation army (PLA) is analyzed, the author according to the time, title, word frequency, report form, the pages and reported topic analyzed one by one, in the process of analysis gradually mastered the People's Daily experience of the people's liberation army's image and the insufficiency; In the People's Daily, the people's liberation army (PLA) is studied when the media image of the change, the author, using the framework analysis found in the history of the people's liberation army presented "war hero", "production and construction hero", "chairman MAO's loyal warriors", "risk and disaster heroes" and "strong shield of Chinese dream" and so on five kind of image. New era, the People's Daily in shaping the image of the people's liberation army, to deeply understand and grasp the important instructions of the party central committee on the military construction, raise the army subject coverage index and the front page, create public opinion heat, multiple reports genre have power, enhance the people's liberation army image of fresh degree, finally to highlight the people's liberation army to victories at the core of the image, in order to realize the motherland dream drum and shout!