Abstract: Validated applicability of electromagnetic similitude principium used in metallic resonance cavity for application of compact model in reverberation chamber design.Calculated mode number that is closely correlated with field uniformity character in reverberation chamber and its compact model, and results showed that mode number satisfied similitude principium.Illuminated field value of observed point in metallic cavity and its compact model have similitude character istic by simulation.Validated the correction of simulation method by the data of measurement.Results of deduction and simulation show that electromagnetic similitude principium can be used in compact model of reverberation chamber.