There are random row-noises in output digital image of near-field optical scanning microscopy because of the scanning way.To adhibit traditional method of filtering the waves cannot effictively wipe off such row-noises.This paper presents a method which combines adaptive iterration and wavelet analysis to filter row-noises.The method of subsectional linearity pseudo-color transformation is presented for emboldening image.The fitting of curve surface is adopted for filtering slowly change row-noises added in signal.