Abstract: Finding a way to eliminate the threats brought by small drones and effectively detect, identify and C-UAS has become a world-class problem. The U. S. military attaches great importance to the development of C-UAS equipment, which is in the development stage of planning, mainly used to deal with the 1,2,3 UAS threats. In this paper, counter -UAS are divided into nine categories—integrated Command and control system, target detection system, electronic jamming system, laser strike system, microwave strike system, net capture system, firepower strike system , integrated system and UAS-counter-UAS system. The paper systematically and comprehensively analyzes American military current ability to counter-UAS based on over 160 kinds of anti-drone systems, and selects 25 typical representatives to conduct in-depth analysis, aiming to find out the development focus, developing trend and path of American counter-UAS systems. What’s more, the paper puts forward some suggestions from the aspects of top-level planning and design, equipment project development, key technology exploration and combat test verification so as to provide some views and thoughts for readers.