In order to accelerate the research and application of 5G in the military field, the research methods and implementation approaches are refined. This paper analyzes the development status, architecture characteristics and key technologies of 5G technology, analyzes 30 policy documents of 5G military application in the United States from multiple perspectives, reviews the progress and focus of 5G military application research in domestic academia, and analyzes the research characteristics and weaknesses. The general idea and overall framework of 5G military applications are proposed, and the military application scenarios are quantitatively analyzed based on the "mapping method".Finally, suggestions and prospects are given. The results show that the study can provide a reference for the strategic top-level design, application priority setting and construction research practice of 5G in the military field.