Abstract: Abstract: Objective/Significance The purpose of this paper is to scientifically elucidate the developmental status of high power microwave technology in the United States, thereby providing informational support for research and development in relevant domestic fields. Method/Process To gain an in-depth understanding of the development of high power microwave technology in the United States, this study conducts literature retrieval based on the Web of Science Core Collection database. Utilizing knowledge graph analysis methods with tools such as VOSviewer, CiteSpace, Excel, and NoteExpress, this research performed a multidimensional analysis from the perspectives of developmental stages, distribution of research strength, and evolution of research hotspots. Results/Conclusions The analysis results show that the development of high power microwave technology in the United States can be roughly divided into six stages, with each stage's publication trend having some connection to the development of high power microwave weapon systems. Research efforts are highly concentrated within a limited number of universities, military laboratories, and research institutions under the Department of Energy, with the University of New Mexico and the Air Force Research Laboratory stand out as critical contributors warranting special attention. The evolution analysis of research hotspots and dynamic information analysis indicate that the main technical roadmap for U.S. high power microwave technology centers on relativistic magnetrons as core components，and current research hotspots focus not only on performance improvement of relativistic magnetrons, but also address frequency agility issues and high power microwave generation technology using nonlinear transmission lines.