Introduction: International standard ISO3745 for the structure of anechoic chamber《Acoustics-Determination of sound power levels of noise sources---—Precision methods for anechoicand semi-anechoic rooms》and GB6882 Standerd《Acoustics-Determination of soundpower of noise source: precision method for anechoic and semi-anechoic rooms》.At the same time to meet the ISO 7779 equipment air noise testing standards.