This book highlights a systematic introduction to the fundamentals and applications of high-power microwave measurement. The book conducts in-depth discussion of the measurement principles, theoretical basis, and measurement methods for the power, frequency, and modes of high-power microwaves. It covers a wide range of applications and comprehensively summarizes latest research advances from global scientists and the authors’ team. The book can be used as a handy reference for researchers and engineers who are engaged in the research and practice of high-power microwaves. It can also be used as lecture notes for university professors and graduate students of related courses.