The input,output and idler cavities of C-band multi-beam klystron were analyzed with the electromagnetic simu-lation software. The overall modeling of the high-frequency interaction area was achieved by means of CHIPIC software. To get the stable and high output power,the parameters,such as electron beam,input power and output coupling structure,were re-searched and analysed. Through the analysis of the results and simulation of the entire structure,the multi-beam klystron can produce the peak output power of 225 kW with efficiency of 50% in the case of electron beam voltage of 28 kV and total beam current of 14.96 A.%采用电磁仿真软件对C波段多注速调管的输入腔、输出腔及中间腔的高频特性进行了冷腔分析。采用CHIPIC软件对高频互作用区进行了整体建模。为得到稳定且较高的输出功率，对电子束，输入功率及输出耦合结构等参数进行研究分析。通过对结果的分析，模拟整个高频结构的工作情况，在电子束电压28 kV，总电流为14.96 A的条件下，得到了功率为225 kW的峰值功率，效率为50%。
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