Abstract: This paper briefly introduces the Waveform Agile Radio-frequency Directed Energy (WARDEN) project released by Defense Advanced Research Projects Agency (DARPA), Directed Energy and Base Defense, and Directed Energy Futures 2060—Visions for the next 40 years of U.S Department of Defense Directed Energy technologies released by Air Force Research Laboratory, focuses on the analysis of high power microwave effect research in the above reports. The present research progress and future research emphases of high power microwave effect in the United States are presented as “further investigating the mechanism of high power microwave backdoor disrupting effect of UAVs and cruise missiles, improving the attack distance of high power microwave weapon system to UAVs and cruise missiles”, these conclusions will provide important references for our high power microwave effect research.