Abstract: Planar near-field acoustic holography (NAH) is ill-posed due to power leakage of the k-space spectrum of the sound pressure distribution as the measuring distance increases when the measurement aperture is limited. This paper first shows that the decaying degree of the evanescent wave is only related to its wavelength. Based on this characteristic, a new type of k-space filter based on the coefficient rule, which describes the relation between the usable components of evanescent wave and the change of measuring distance, has been obtained. The filter ensures a maximum range of usable evanescent wave without the ill-posed problem. A comparison of the sound pressure reconstruction result calculated using different ranges of the evanescent wave verifies the applicability and rationality of the k-space filter.