The present invention relates to a multi-cell output resonance cavity optimal design method for high-efficiency klystron wherein a design method for optimally designing a multi-cell output resonance cavity to obtain the best power conversion efficiency is provided. The multi-cell output resonance cavity optimal design method for high-efficiency klystron comprises the following steps: determining a variable to be scanned, scan intervals, and a maximum scan index; making an input file based on the determined variable and interval information; performing computer simulation by using a computer simulation code based on the input file; extracting analysis information for determining a design variable for an optimal design of the multi-cell output resonance cavity based on a result of performing computer simulation; comparing the analysis information with a predetermined reference tolerance value to determine maximization of power conversion efficiency; and storing the determined variable as an input and output variable for an optimal design for the multi-cell output resonance cavity when the analysis information is within the reference tolerance value.
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