摘要：The paper mainly presents the design of beam-wave interaction of a C-band high-peakpower high-efficiency broadband *** beam-wave interaction section is designed based on considerations of efficiency and bandwidth *** a part of beam-wave interaction section,buncher section is simulated by Particle-In-Cell(PIC) code to observe the bunching process of electron beam to achieve high conversion efficiency of electron beam and RF *** it comes to the other part,output circuit is designed as a three-section filter by an output cavity loaded with Chebyshev filter,and the cold test results are *** beam-wave interaction is simulated by EGUN code and Arsenal-MSU code *** simulated results indicated that,the existence of power dips in the operating bandwidth is verified by Arsenal-MSU code,comparing proper results by EGUN ***,the method that design parameters are not adjusted except parameters of buncher cavities to remove potential power dips is *** is more,the simulated results of electron optics system are given by EGUN code and Arsenal-MSU code *** further hot test results of klystron prove that the whole design of beam-wave interaction is effective.