Abstract: In this paper,the application of adaptive technique for narrow-band suppression in spread-spectrum (SS) communication is discussed and its numerical robustness is analyzed.In order to increase the converge rate and improve the output signal noise ratio,a combined filter mode is proposed and a new combinde adaptive filter is constructed based on a interpolator filter.Finally,the interference suppression ability of both basic adaptive filters and its combined counterparts is compared in theory and in practice.