The acoustic perceptual difference between the muhitone with 5, 10, 20, 30, 50 and 100 components and the narrow-band white noise in the same critical band is resolved for the 10 critical bands of 3, 5, 7, 9, 11, 13, 15, 17, 19 and 21. The results show that the perceptual difference between muhitone and narrow-band white noise becomes more and more difficult to resolve with the increase in the number of frequency components, and that, at a certain number of frequency components, the multitone with high frequency is closer to the narrow-band white noise. The results also reflect human ears＇ ability of distinguishing frequency, that is, the frequency resolu- tion of human ears is related to the critical band. The higher the critical band index, the worse the frequency reso- lution of ears, and the closer the muhitone to the narrow-band white noise.