Abstract: The need for reducing the computational complexity and improving the precision of feature extracting of the Cyclic Spectral Density (CSD), the CSD gathering slice method was proposed, that is the peak frequencies of Cyclic Autocorrelation Function(CAF) slice are chosen as cyclic frequency to calculate a set of CSD slices and the feature frequencies of sound field signal are extracted by the CSD gathering slices. And the CSD, instead of the power spectrum of sound signal is adopted as reconstructed physical quantity in the planar near-field acoustic holography. The experiment results illustrate that modulation characteristics of cyclostationary sound field can be directly extracted and noise source can be exactly localized.