The purpose of this study is to analysis the 3 differential size of the interior space for impulse noise. To achieve thisgoal the 3 kinds (27, 35, 50 m3) of interior space were performed comparing the impulse noise. Result of this study, the standarderror of the mean peak sound pressure of value from 0.19 to 0.27dB and there was no significant difference (p<0.01). AndB-duration is significant differences (P<0.01) range from 3.98 to 7.93ms. This is respectively less than 10ms. These findings areconfirmed in accordance by the 3 differential space size of the indoor-impulse noise due to 0.3 dB or less, so there was nodifference to the operational influence. And also below 100 Hz were found fundamental mode frequency analysis. Results werematched with calculated theoretical values.