本文以知识生命周期为理论支撑，以科学知识图谱作为技术手段，选取2001年至2016年间有效学术论文计9954篇。研究发现，在时间维度，新闻传播学研究呈现出较清晰的知识生命周期脉络，议题的知识流动和知识结构上都呈现有明显时间规律的代际更迭。其演进动因是技术的变化，证明了新闻传播学研究仍是以实践为导向的科学，更迭模式不是单向度议题转移，也不是循环式的议题重生，而是不同议题相互勾连，不断更新，呈网状结构向外拓研究的广度和深度；在空间维度，描绘了新闻传播学的学术权力地图，对于不同研究者、研究机构、研究议题的权重度和合作关系都进行了描述性研究，分析了现有学术权力地图中存在的格局固化、马太效应、学术共同体松散等问题，从而得出形成学术权力地图，并认为改善现有学术权力地图的动因在于作者间赋权和机构间合作。

This research took knowledge life cycle as a theoretical basis, and chose Journal of International Communication, Journalism Quarterly, Journalism & Communication, and Modern Communication as study samples. Based on the analysis of the literature, researchers, research institutions, research keywords etc., the authors draw a panoramic description of the life cycle and operating mechanism of mainland journalism and communication studies.In the time dimension, mainland journalism and communication studies show clear develop context in both knowledge flows and knowledge structures. The main motivation of knowledge intergeneration is the change of communication environment. The change path of study issues is not unidirectional transferred nor circulating rebirthed, but the reticular structure with outward extension of the breadth and depth of research. In the spatial dimension, we gave a comprehensive description of academic power map, and conducted a descriptive study of researchers, research institutions, and the partnership between different samples. The main motivation of academic power map is empowering behaviors between researchers and cooperation among research institutions.